common.inc 41 KB
Newer Older
Dries Buytaert's avatar
   
Dries Buytaert committed
1
<?php
2
// $Id$
Dries Buytaert's avatar
   
Dries Buytaert committed
3

Dries Buytaert's avatar
   
Dries Buytaert committed
4
5
6
7
8
9
10
11
/**
 * @file
 * Common functions that many Drupal modules will need to reference.
 *
 * The functions that are critical and need to be available even when serving
 * a cached page are instead located in bootstrap.inc.
 */

12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
/**
 * Return status for saving which involved creating a new item.
 */
define('SAVED_NEW', 1);

/**
 * Return status for saving which involved an update to an existing item.
 */
define('SAVED_UPDATED', 2);

/**
 * Return status for saving which deleted an existing item.
 */
define('SAVED_DELETED', 3);

27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
/**
 * Set content for a specified region.
 *
 * @param $region
 *   Page region the content is assigned to.
 *
 * @param $data
 *   Content to be set.
 */
function drupal_set_content($region = null, $data = null) {
  static $content = array();

  if (!is_null($region) && !is_null($data)) {
    $content[$region][] = $data;
  }
  return $content;
}

/**
 * Get assigned content.
 *
 * @param $region
 *   A specified region to fetch content for.  If null, all regions will be returned.
 *
 * @param $delimiter
 *   Content to be inserted between exploded array elements.
 */
54
function drupal_get_content($region = NULL, $delimiter = ' ') {
55
  $content = drupal_set_content();
56
57
  if (isset($region)) {
    if (isset($content[$region]) && is_array($content[$region])) {
Steven Wittens's avatar
Steven Wittens committed
58
      return implode($delimiter, $content[$region]);
59
    }
60
61
62
63
  }
  else {
    foreach (array_keys($content) as $region) {
      if (is_array($content[$region])) {
Steven Wittens's avatar
Steven Wittens committed
64
        $content[$region] = implode($delimiter, $content[$region]);
65
66
67
68
69
70
      }
    }
    return $content;
  }
}

Dries Buytaert's avatar
   
Dries Buytaert committed
71
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
72
 * Set the breadcrumb trail for the current page.
Dries Buytaert's avatar
   
Dries Buytaert committed
73
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
74
75
76
 * @param $breadcrumb
 *   Array of links, starting with "home" and proceeding up to but not including
 *   the current page.
77
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
78
79
80
function drupal_set_breadcrumb($breadcrumb = NULL) {
  static $stored_breadcrumb;

81
  if (!is_null($breadcrumb)) {
Dries Buytaert's avatar
   
Dries Buytaert committed
82
83
84
85
86
    $stored_breadcrumb = $breadcrumb;
  }
  return $stored_breadcrumb;
}

Dries Buytaert's avatar
   
Dries Buytaert committed
87
88
89
/**
 * Get the breadcrumb trail for the current page.
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
90
91
92
function drupal_get_breadcrumb() {
  $breadcrumb = drupal_set_breadcrumb();

93
  if (is_null($breadcrumb)) {
Dries Buytaert's avatar
   
Dries Buytaert committed
94
95
96
97
98
99
    $breadcrumb = menu_get_active_breadcrumb();
  }

  return $breadcrumb;
}

Dries Buytaert's avatar
Dries Buytaert committed
100
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
101
 * Add output to the head tag of the HTML page.
Dries Buytaert's avatar
   
Dries Buytaert committed
102
 * This function can be called as long the headers aren't sent.
Dries Buytaert's avatar
Dries Buytaert committed
103
104
 */
function drupal_set_html_head($data = NULL) {
Dries Buytaert's avatar
   
Dries Buytaert committed
105
  static $stored_head = '';
Dries Buytaert's avatar
Dries Buytaert committed
106
107

  if (!is_null($data)) {
Dries Buytaert's avatar
   
Dries Buytaert committed
108
    $stored_head .= $data ."\n";
Dries Buytaert's avatar
Dries Buytaert committed
109
110
111
112
  }
  return $stored_head;
}

Dries Buytaert's avatar
   
Dries Buytaert committed
113
114
115
/**
 * Retrieve output to be displayed in the head tag of the HTML page.
 */
Dries Buytaert's avatar
Dries Buytaert committed
116
function drupal_get_html_head() {
Dries Buytaert's avatar
   
Dries Buytaert committed
117
  $output = "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />\n";
118
  $output .= theme('stylesheet_import', base_path() .'misc/drupal.css');
Dries Buytaert's avatar
Dries Buytaert committed
119
120
121
  return $output . drupal_set_html_head();
}

Dries Buytaert's avatar
   
Dries Buytaert committed
122
/**
123
 * Reset the static variable which holds the aliases mapped for this request.
Dries Buytaert's avatar
   
Dries Buytaert committed
124
 */
125
126
function drupal_clear_path_cache() {
  drupal_lookup_path('wipe');
Dries Buytaert's avatar
   
Dries Buytaert committed
127
}
128

Dries Buytaert's avatar
Dries Buytaert committed
129
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
130
 * Set an HTTP response header for the current page.
Dries Buytaert's avatar
Dries Buytaert committed
131
132
 */
function drupal_set_header($header = NULL) {
133
  // We use an array to guarantee there are no leading or trailing delimiters.
Dries Buytaert's avatar
   
Dries Buytaert committed
134
  // Otherwise, header('') could get called when serving the page later, which
135
136
  // ends HTTP headers prematurely on some PHP versions.
  static $stored_headers = array();
Dries Buytaert's avatar
Dries Buytaert committed
137

138
  if (strlen($header)) {
Dries Buytaert's avatar
Dries Buytaert committed
139
    header($header);
140
    $stored_headers[] = $header;
Dries Buytaert's avatar
Dries Buytaert committed
141
  }
142
  return implode("\n", $stored_headers);
Dries Buytaert's avatar
Dries Buytaert committed
143
144
}

Dries Buytaert's avatar
   
Dries Buytaert committed
145
146
147
/**
 * Get the HTTP response headers for the current page.
 */
Dries Buytaert's avatar
Dries Buytaert committed
148
149
150
151
function drupal_get_headers() {
  return drupal_set_header();
}

Dries Buytaert's avatar
   
Dries Buytaert committed
152
153
154
/**
 * @name HTTP handling
 * @{
Dries Buytaert's avatar
   
Dries Buytaert committed
155
 * Functions to properly handle HTTP responses.
Dries Buytaert's avatar
   
Dries Buytaert committed
156
157
 */

158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
/**
 * Parse an array into a valid urlencoded query string.
 *
 * @param $query
 *   The array to be processed e.g. $_GET
 * @param $exclude
 *   The array filled with keys to be excluded. Use parent[child] to exclude nested items.
 * @param $urlencode
 *   If TRUE, the keys and values are both urlencoded.
 * @param $parent
 *   Should not be passed, only used in recursive calls
 * @return
 *   urlencoded string which can be appended to/as the URL query string
 */
function drupal_query_string_encode($query, $exclude = array(), $parent = '') {
  $params = array();

  foreach ($query as $key => $value) {
    if ($parent) {
      $key = $parent .'['. urlencode($key) .']';
    }
    else {
      $key = urlencode($key);
    }

    if (in_array(urldecode($key), $exclude)) {
      continue;
    }

    if (is_array($value)) {
      $params[] = drupal_query_string_encode($value, $exclude, $key);
    }
    else {
      $params[] = $key .'='. urlencode($value);
    }
  }

  return implode('&', $params);
}

198
199
/**
 * Prepare a destination query string for use in combination with
200
201
202
203
204
 * drupal_goto(). Used to direct the user back to the referring page
 * after completing a form. By default the current URL is returned.
 * If a destination exists in the previous request, that destination
 * is returned.  As such, a destination can persist across multiple
 * pages.
205
206
207
208
 *
 * @see drupal_goto()
 */
function drupal_get_destination() {
209
210
211
212
  if ($_REQUEST['destination']) {
    return 'destination='. urlencode($_REQUEST['destination']);
  }
  else {
213
    $path = $_GET['q'];
214
215
216
    $query = drupal_query_string_encode($_GET, array('q'));
    if ($query != '') {
      $path .= '?'. $query;
217
    }
218
    return 'destination='. urlencode($path);
219
220
221
  }
}

222
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
223
 * Send the user to a different Drupal page.
224
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
225
226
 * This issues an on-site HTTP redirect. The function makes sure the redirected
 * URL is formatted correctly.
227
 *
228
229
230
231
232
233
234
235
236
237
 * Usually the redirected URL is constructed from this function's input
 * parameters.  However you may override that behavior by setting a
 * <em>destination</em> in either the $_REQUEST-array (i.e. by using
 * the query string of an URI) or the $_REQUEST['edit']-array (i.e. by
 * using a hidden form field).  This is used to direct the user back to
 * the proper page after completing a form.  For example, after editing
 * a post on the 'admin/node'-page or after having logged on using the
 * 'user login'-block in a sidebar.  The function drupal_get_destination()
 * can be used to help set the destination URL.
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
238
239
240
241
242
243
244
245
246
247
248
249
250
 * It is advised to use drupal_goto() instead of PHP's header(), because
 * drupal_goto() will append the user's session ID to the URI when PHP is
 * compiled with "--enable-trans-sid".
 *
 * This function ends the request; use it rather than a print theme('page')
 * statement in your menu callback.
 *
 * @param $path
 *   A Drupal path.
 * @param $query
 *   The query string component, if any.
 * @param $fragment
 *   The destination fragment identifier (named anchor).
251
252
 *
 * @see drupal_get_destination()
253
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
254
function drupal_goto($path = '', $query = NULL, $fragment = NULL) {
255
  if (isset($_REQUEST['destination'])) {
256
257
    extract(parse_url($_REQUEST['destination']));
  }
258
  else if (isset($_REQUEST['edit']['destination'])) {
259
260
261
    extract(parse_url($_REQUEST['edit']['destination']));
  }

262
  $url = url($path, $query, $fragment, TRUE);
263

Dries Buytaert's avatar
   
Dries Buytaert committed
264
265
266
267
  // Before the redirect, allow modules to react to the end of the page request.
  module_invoke_all('exit', $url);

  header('Location: '. $url);
268

Dries Buytaert's avatar
   
Dries Buytaert committed
269
270
271
  // The "Location" header sends a REDIRECT status code to the http
  // daemon. In some cases this can go wrong, so we make sure none
  // of the code below the drupal_goto() call gets executed when we redirect.
272
273
274
  exit();
}

275
/**
276
 * Generates a site off-line message
277
278
 */
function drupal_site_offline() {
279
  drupal_set_header('HTTP/1.0 503 Service unavailable');
280
  drupal_set_title(t('Site off-line'));
281
282
  print theme('maintenance_page', filter_xss_admin(variable_get('site_offline_message',
    t('%site is currently under maintenance. We should be back shortly. Thank you for your patience.', array('%site' => variable_get('site_name', t('This Drupal site')))))));
283
284
}

285
286
287
/**
 * Generates a 404 error if the request can not be handled.
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
288
function drupal_not_found() {
289
  drupal_set_header('HTTP/1.0 404 Not Found');
290
  watchdog('page not found', t('%page not found.', array('%page' => theme('placeholder', $_GET['q']))), WATCHDOG_WARNING);
Dries Buytaert's avatar
   
Dries Buytaert committed
291

292
293
294
295
296
  // Keep old path for reference
  if (!isset($_REQUEST['destination'])) {
    $_REQUEST['destination'] = $_GET['q'];
  }

Dries Buytaert's avatar
   
Dries Buytaert committed
297
  $path = drupal_get_normal_path(variable_get('site_404', ''));
298
  if ($path && $path != $_GET['q']) {
Dries Buytaert's avatar
   
Dries Buytaert committed
299
    menu_set_active_item($path);
300
    $return = menu_execute_active_handler();
Dries Buytaert's avatar
   
Dries Buytaert committed
301
  }
302
  else {
303
    // Redirect to a non-existent menu item to make possible tabs disappear.
304
    menu_set_active_item('');
305
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
306

307
  if (empty($return)) {
308
    drupal_set_title(t('Page not found'));
Dries Buytaert's avatar
   
Dries Buytaert committed
309
  }
310
  print theme('page', $return);
Dries Buytaert's avatar
   
Dries Buytaert committed
311
}
Dries Buytaert's avatar
   
Dries Buytaert committed
312

Dries Buytaert's avatar
   
Dries Buytaert committed
313
314
315
316
/**
 * Generates a 403 error if the request is not allowed.
 */
function drupal_access_denied() {
317
  drupal_set_header('HTTP/1.0 403 Forbidden');
318
  watchdog('access denied', t('%page denied access.', array('%page' => theme('placeholder', $_GET['q']))), WATCHDOG_WARNING, l(t('view'), $_GET['q']));
Dries Buytaert's avatar
   
Dries Buytaert committed
319

320
321
322
323
324
  // Keep old path for reference
  if (!isset($_REQUEST['destination'])) {
    $_REQUEST['destination'] = $_GET['q'];
  }

Dries Buytaert's avatar
   
Dries Buytaert committed
325
  $path = drupal_get_normal_path(variable_get('site_403', ''));
326
  if ($path && $path != $_GET['q']) {
Dries Buytaert's avatar
   
Dries Buytaert committed
327
    menu_set_active_item($path);
328
    $return = menu_execute_active_handler();
Dries Buytaert's avatar
   
Dries Buytaert committed
329
  }
330
  else {
331
    // Redirect to a non-existent menu item to make possible tabs disappear.
332
    menu_set_active_item('');
333
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
334

335
  if (empty($return)) {
336
    drupal_set_title(t('Access denied'));
337
    $return = t('You are not authorized to access this page.');
Dries Buytaert's avatar
   
Dries Buytaert committed
338
  }
339
  print theme('page', $return);
Dries Buytaert's avatar
   
Dries Buytaert committed
340
341
}

Dries Buytaert's avatar
   
Dries Buytaert committed
342
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
343
 * Perform an HTTP request.
Dries Buytaert's avatar
   
Dries Buytaert committed
344
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
 * This is a flexible and powerful HTTP client implementation. Correctly handles
 * GET, POST, PUT or any other HTTP requests. Handles redirects.
 *
 * @param $url
 *   A string containing a fully qualified URI.
 * @param $headers
 *   An array containing an HTTP header => value pair.
 * @param $method
 *   A string defining the HTTP request to use.
 * @param $data
 *   A string containing data to include in the request.
 * @param $retry
 *   An integer representing how many times to retry the request in case of a
 *   redirect.
 * @return
 *   An object containing the HTTP request headers, response code, headers,
 *   data, and redirect status.
Dries Buytaert's avatar
   
Dries Buytaert committed
362
363
 */
function drupal_http_request($url, $headers = array(), $method = 'GET', $data = NULL, $retry = 3) {
Dries Buytaert's avatar
   
Dries Buytaert committed
364
365
  $result = new StdClass();

Dries Buytaert's avatar
   
Dries Buytaert committed
366
  // Parse the URL, and make sure we can handle the schema.
Dries Buytaert's avatar
   
Dries Buytaert committed
367
368
369
  $uri = parse_url($url);
  switch ($uri['scheme']) {
    case 'http':
370
      $port = isset($uri['port']) ? $uri['port'] : 80;
371
      $host = $uri['host'] . ($port != 80 ? ':'. $port : '');
372
      $fp = @fsockopen($uri['host'], $port, $errno, $errstr, 15);
Dries Buytaert's avatar
   
Dries Buytaert committed
373
374
      break;
    case 'https':
Dries Buytaert's avatar
   
Dries Buytaert committed
375
      // Note: Only works for PHP 4.3 compiled with OpenSSL.
376
      $port = isset($uri['port']) ? $uri['port'] : 443;
377
      $host = $uri['host'] . ($port != 443 ? ':'. $port : '');
378
      $fp = @fsockopen('ssl://'. $uri['host'], $port, $errno, $errstr, 20);
Dries Buytaert's avatar
   
Dries Buytaert committed
379
380
      break;
    default:
Dries Buytaert's avatar
   
Dries Buytaert committed
381
      $result->error = 'invalid schema '. $uri['scheme'];
Dries Buytaert's avatar
   
Dries Buytaert committed
382
383
384
      return $result;
  }

Dries Buytaert's avatar
   
Dries Buytaert committed
385
  // Make sure the socket opened properly.
Dries Buytaert's avatar
   
Dries Buytaert committed
386
  if (!$fp) {
Dries Buytaert's avatar
   
Dries Buytaert committed
387
    $result->error = trim($errno .' '. $errstr);
Dries Buytaert's avatar
   
Dries Buytaert committed
388
389
390
    return $result;
  }

Dries Buytaert's avatar
   
Dries Buytaert committed
391
  // Construct the path to act on.
392
393
  $path = isset($uri['path']) ? $uri['path'] : '/';
  if (isset($uri['query'])) {
Dries Buytaert's avatar
   
Dries Buytaert committed
394
    $path .= '?'. $uri['query'];
Dries Buytaert's avatar
   
Dries Buytaert committed
395
396
  }

Dries Buytaert's avatar
   
Dries Buytaert committed
397
  // Create HTTP request.
Dries Buytaert's avatar
   
Dries Buytaert committed
398
  $defaults = array(
399
400
401
402
    // RFC 2616: "non-standard ports MUST, default ports MAY be included".
    // We don't add the port to prevent from breaking rewrite rules checking
    // the host that do not take into account the port number.
    'Host' => "Host: $host",
403
    'User-Agent' => 'User-Agent: Drupal (+http://drupal.org/)',
404
    'Content-Length' => 'Content-Length: '. strlen($data)
Dries Buytaert's avatar
   
Dries Buytaert committed
405
406
407
  );

  foreach ($headers as $header => $value) {
Dries Buytaert's avatar
   
Dries Buytaert committed
408
    $defaults[$header] = $header .': '. $value;
Dries Buytaert's avatar
   
Dries Buytaert committed
409
410
  }

Dries Buytaert's avatar
   
Dries Buytaert committed
411
  $request = $method .' '. $path ." HTTP/1.0\r\n";
Dries Buytaert's avatar
   
Dries Buytaert committed
412
413
414
  $request .= implode("\r\n", $defaults);
  $request .= "\r\n\r\n";
  if ($data) {
Dries Buytaert's avatar
   
Dries Buytaert committed
415
    $request .= $data ."\r\n";
Dries Buytaert's avatar
   
Dries Buytaert committed
416
417
418
419
420
421
  }
  $result->request = $request;

  fwrite($fp, $request);

  // Fetch response.
422
  $response = '';
423
424
  while (!feof($fp) && $chunk = fread($fp, 1024)) {
    $response .= $chunk;
Dries Buytaert's avatar
   
Dries Buytaert committed
425
426
427
428
  }
  fclose($fp);

  // Parse response.
429
430
  list($split, $result->data) = explode("\r\n\r\n", $response, 2);
  $split = preg_split("/\r\n|\n|\r/", $split);
431

432
  list($protocol, $code, $text) = explode(' ', trim(array_shift($split)), 3);
Dries Buytaert's avatar
   
Dries Buytaert committed
433
434
435
  $result->headers = array();

  // Parse headers.
436
  while ($line = trim(array_shift($split))) {
Dries Buytaert's avatar
   
Dries Buytaert committed
437
    list($header, $value) = explode(':', $line, 2);
438
439
440
441
442
443
444
445
    if (isset($result->headers[$header]) && $header == 'Set-Cookie') {
      // RFC 2109: the Set-Cookie response header comprises the token Set-
      // Cookie:, followed by a comma-separated list of one or more cookies.
      $result->headers[$header] .= ','. trim($value);
    }
    else {
      $result->headers[$header] = trim($value);
    }
Dries Buytaert's avatar
   
Dries Buytaert committed
446
447
448
449
450
451
452
453
454
455
  }

  $responses = array(
    100 => 'Continue', 101 => 'Switching Protocols',
    200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content',
    300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect',
    400 => 'Bad Request', 401 => 'Unauthorized', 402 => 'Payment Required', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Time-out', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Large', 415 => 'Unsupported Media Type', 416 => 'Requested range not satisfiable', 417 => 'Expectation Failed',
    500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Time-out', 505 => 'HTTP Version not supported'
  );
  // RFC 2616 states that all unknown HTTP codes must be treated the same as
Dries Buytaert's avatar
   
Dries Buytaert committed
456
  // the base code in their class.
Dries Buytaert's avatar
   
Dries Buytaert committed
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
  if (!isset($responses[$code])) {
    $code = floor($code / 100) * 100;
  }

  switch ($code) {
    case 200: // OK
    case 304: // Not modified
      break;
    case 301: // Moved permanently
    case 302: // Moved temporarily
    case 307: // Moved temporarily
      $location = $result->headers['Location'];

      if ($retry) {
        $result = drupal_http_request($result->headers['Location'], $headers, $method, $data, --$retry);
        $result->redirect_code = $result->code;
      }
      $result->redirect_url = $location;

      break;
    default:
      $result->error = $text;
  }

  $result->code = $code;
  return $result;
}
Dries Buytaert's avatar
   
Dries Buytaert committed
484
485
486
/**
 * @} End of "HTTP handling".
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
487

Dries Buytaert's avatar
   
Dries Buytaert committed
488
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
489
490
 * Log errors as defined by administrator
 * Error levels:
491
492
 *  0 = Log errors to database.
 *  1 = Log errors to database and to screen.
Dries Buytaert's avatar
   
Dries Buytaert committed
493
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
494
function error_handler($errno, $message, $filename, $line) {
495
  if ($errno & (E_ALL ^ E_NOTICE)) {
Dries Buytaert's avatar
   
Dries Buytaert committed
496
497
    $types = array(1 => 'error', 2 => 'warning', 4 => 'parse error', 8 => 'notice', 16 => 'core error', 32 => 'core warning', 64 => 'compile error', 128 => 'compile warning', 256 => 'user error', 512 => 'user warning', 1024 => 'user notice', 2048 => 'strict warning');
    $entry = $types[$errno] .': '. $message .' in '. $filename .' on line '. $line .'.';
Dries Buytaert's avatar
   
Dries Buytaert committed
498

499
500
    // Note: force display of error messages in update.php
    if (variable_get('error_level', 1) == 1 || strstr($_SERVER['PHP_SELF'], 'update.php')) {
501
      drupal_set_message($entry, 'error');
Dries Buytaert's avatar
Dries Buytaert committed
502
    }
503
504

    watchdog('php', t('%message in %file on line %line.', array('%error' => $types[$errno], '%message' => $message, '%file' => $filename, '%line' => $line)), WATCHDOG_ERROR);
Dries Buytaert's avatar
   
Dries Buytaert committed
505
506
507
  }
}

Dries Buytaert's avatar
   
Dries Buytaert committed
508
function _fix_gpc_magic(&$item) {
Dries Buytaert's avatar
Dries Buytaert committed
509
  if (is_array($item)) {
Kjartan Mannes's avatar
Kjartan Mannes committed
510
511
512
    array_walk($item, '_fix_gpc_magic');
  }
  else {
Kjartan Mannes's avatar
Kjartan Mannes committed
513
    $item = stripslashes($item);
Dries Buytaert's avatar
   
Dries Buytaert committed
514
515
516
  }
}

Dries Buytaert's avatar
   
Dries Buytaert committed
517
518
519
520
/**
 * Correct double-escaping problems caused by "magic quotes" in some PHP
 * installations.
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
521
522
function fix_gpc_magic() {
  static $fixed = false;
Dries Buytaert's avatar
   
Dries Buytaert committed
523
  if (!$fixed && ini_get('magic_quotes_gpc')) {
Dries Buytaert's avatar
Dries Buytaert committed
524
525
526
527
528
529
    array_walk($_GET, '_fix_gpc_magic');
    array_walk($_POST, '_fix_gpc_magic');
    array_walk($_COOKIE, '_fix_gpc_magic');
    array_walk($_REQUEST, '_fix_gpc_magic');
    $fixed = true;
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
530
531
}

532
533
534
/**
 * @name Messages
 * @{
Dries Buytaert's avatar
   
Dries Buytaert committed
535
 * Frequently used messages.
536
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
537
538
539
540

/**
 * Return a string with a "not applicable" message.
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
541
function message_na() {
Dries Buytaert's avatar
   
Dries Buytaert committed
542
  return t('n/a');
Dries Buytaert's avatar
   
Dries Buytaert committed
543
544
}

Dries Buytaert's avatar
   
Dries Buytaert committed
545
546
547
/**
 * @} End of "Messages".
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
548

Dries Buytaert's avatar
   
Dries Buytaert committed
549
550
551
/**
 * Initialize the localization system.
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
552
553
function locale_initialize() {
  global $user;
Dries Buytaert's avatar
   
Dries Buytaert committed
554
555
556
557
558

  if (function_exists('i18n_get_lang')) {
    return i18n_get_lang();
  }

Dries Buytaert's avatar
   
Dries Buytaert committed
559
560
561
562
563
  if (function_exists('locale')) {
    $languages = locale_supported_languages();
    $languages = $languages['name'];
  }
  else {
564
565
566
    // Ensure the locale/language is correctly returned, even without locale.module.
    // Useful for e.g. XML/HTML 'lang' attributes.
    $languages = array('en' => 'English');
Dries Buytaert's avatar
   
Dries Buytaert committed
567
  }
568
  if ($user->uid && isset($languages[$user->language])) {
Dries Buytaert's avatar
   
Dries Buytaert committed
569
570
571
572
573
    return $user->language;
  }
  else {
    return key($languages);
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
574
575
}

576
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
577
 * Translate strings to the current locale.
578
 *
579
 * When using t(), try to put entire sentences and strings in one t() call.
Dries Buytaert's avatar
   
Dries Buytaert committed
580
581
582
583
 * This makes it easier for translators. HTML markup within translation strings
 * is acceptable, if necessary. The suggested syntax for a link embedded
 * within a translation string is:
 * @code
Dries Buytaert's avatar
   
Dries Buytaert committed
584
585
586
 *   $msg = t('You must log in below or <a href="%url">create a new
 *             account</a> before viewing the next page.', array('%url'
 *             => url('user/register')));
Dries Buytaert's avatar
   
Dries Buytaert committed
587
 * @endcode
588
589
590
 * We suggest the same syntax for links to other sites. This makes it easy to
 * change link URLs if needed (which happens often) without requiring updates
 * to translations.
591
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
592
 * @param $string
Dries Buytaert's avatar
   
Dries Buytaert committed
593
 *   A string containing the English string to translate.
Dries Buytaert's avatar
   
Dries Buytaert committed
594
595
 * @param $args
 *   An associative array of replacements to make after translation. Incidences
Dries Buytaert's avatar
   
Dries Buytaert committed
596
 *   of any key in this array are replaced with the corresponding value.
Dries Buytaert's avatar
   
Dries Buytaert committed
597
598
 * @return
 *   The translated string.
599
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
600
function t($string, $args = 0) {
Dries Buytaert's avatar
   
Dries Buytaert committed
601
602
603
604
  global $locale;
  if (function_exists('locale') && $locale != 'en') {
    $string = locale($string);
  }
605

Dries Buytaert's avatar
   
Dries Buytaert committed
606
607
  if (!$args) {
    return $string;
Kjartan Mannes's avatar
Kjartan Mannes committed
608
609
  }
  else {
Dries Buytaert's avatar
   
Dries Buytaert committed
610
611
    return strtr($string, $args);
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
612
613
}

614
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
615
 * @defgroup validation Input validation
Dries Buytaert's avatar
   
Dries Buytaert committed
616
 * @{
Dries Buytaert's avatar
   
Dries Buytaert committed
617
 * Functions to validate user input.
618
619
 */

620
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
621
622
623
 * Verify the syntax of the given e-mail address.
 *
 * Empty e-mail addresses are allowed. See RFC 2822 for details.
624
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
625
 * @param $mail
626
 *   A string containing an e-mail address.
Dries Buytaert's avatar
   
Dries Buytaert committed
627
 * @return
Dries Buytaert's avatar
   
Dries Buytaert committed
628
 *   TRUE if the address is in a valid format.
629
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
630
function valid_email_address($mail) {
631
  $user = '[a-zA-Z0-9_\-\.\+\^!#\$%&*+\/\=\?\`\|\{\}~\']+';
632
  $domain = '(?:(?:[a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.?)+';
633
634
635
  $ipv4 = '[0-9]{1,3}(\.[0-9]{1,3}){3}';
  $ipv6 = '[0-9a-fA-F]{1,4}(\:[0-9a-fA-F]{1,4}){7}';

Dries Buytaert's avatar
Dries Buytaert committed
636
  return preg_match("/^$user@($domain|(\[($ipv4|$ipv6)\]))$/", $mail);
637
638
}

Dries Buytaert's avatar
   
Dries Buytaert committed
639
640
641
/**
 * Verify the syntax of the given URL.
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
642
 * @param $url
Dries Buytaert's avatar
   
Dries Buytaert committed
643
 *   The URL to verify.
Dries Buytaert's avatar
   
Dries Buytaert committed
644
 * @param $absolute
Dries Buytaert's avatar
   
Dries Buytaert committed
645
 *   Whether the URL is absolute (beginning with a scheme such as "http:").
Dries Buytaert's avatar
   
Dries Buytaert committed
646
 * @return
Dries Buytaert's avatar
   
Dries Buytaert committed
647
 *   TRUE if the URL is in a valid format.
Dries Buytaert's avatar
   
Dries Buytaert committed
648
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
649
function valid_url($url, $absolute = FALSE) {
650
  $allowed_characters = '[a-z0-9\/:_\-_\.\?\$,~=#&%\+]';
651
  if ($absolute) {
652
    return preg_match("/^(http|https|ftp):\/\/". $allowed_characters ."+$/i", $url);
653
654
  }
  else {
655
    return preg_match("/^". $allowed_characters ."+$/i", $url);
656
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
657
658
}

Dries Buytaert's avatar
   
Dries Buytaert committed
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
/**
 * Register an event for the current visitor (hostname/IP) to the flood control mechanism.
 *
 * @param $name
 *   The name of the event.
 */
function flood_register_event($name) {
  db_query("INSERT INTO {flood} (event, hostname, timestamp) VALUES ('%s', '%s', %d)", $name, $_SERVER['REMOTE_ADDR'], time());
}

/**
 * Check if the current visitor (hostname/IP) is allowed to proceed with the specified event.
 * The user is allowed to proceed if he did not trigger the specified event more than
 * $threshold times per hour.
 *
 * @param $name
 *   The name of the event.
 * @param $number
 *   The maximum number of the specified event per hour (per visitor).
 * @return
 *   True if the user did not exceed the hourly threshold.  False otherwise.
 */
function flood_is_allowed($name, $threshold) {
  $number = db_num_rows(db_query("SELECT event FROM {flood} WHERE event = '%s' AND hostname = '%s' AND timestamp > %d", $name, $_SERVER['REMOTE_ADDR'], time() - 3600));
  return ($number < $threshold ? TRUE : FALSE);
}

686
687
function check_file($filename) {
  return is_uploaded_file($filename);
Dries Buytaert's avatar
   
Dries Buytaert committed
688
689
}

690
691
692
693
694
/**
 * Prepare a URL for use in an HTML attribute. Strips harmful protocols.
 *
 */
function check_url($uri) {
695
  return filter_xss_bad_protocol($uri, FALSE);
696
697
}

Dries Buytaert's avatar
   
Dries Buytaert committed
698
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
699
 * @defgroup format Formatting
Dries Buytaert's avatar
   
Dries Buytaert committed
700
 * @{
Dries Buytaert's avatar
   
Dries Buytaert committed
701
 * Functions to format numbers, strings, dates, etc.
Dries Buytaert's avatar
   
Dries Buytaert committed
702
703
 */

Dries Buytaert's avatar
   
Dries Buytaert committed
704
705
706
707
708
709
/**
 * Formats an RSS channel.
 *
 * Arbitrary elements may be added using the $args associative array.
 */
function format_rss_channel($title, $link, $description, $items, $language = 'en', $args = array()) {
Dries Buytaert's avatar
   
Dries Buytaert committed
710
711
  // arbitrary elements may be added using the $args associative array

Dries Buytaert's avatar
Dries Buytaert committed
712
  $output = "<channel>\n";
713
714
  $output .= ' <title>'. check_plain($title) ."</title>\n";
  $output .= ' <link>'. check_url($link) ."</link>\n";
715
716
717
718
719

  // The RSS 2.0 "spec" doesn't indicate HTML can be used in the description.
  // We strip all HTML tags, but need to prevent double encoding from properly
  // escaped source data (such as &amp becoming &amp;amp;).
  $output .= ' <description>'. check_plain(decode_entities(strip_tags($description))) ."</description>\n";
720
  $output .= ' <language>'. check_plain($language) ."</language>\n";
Dries Buytaert's avatar
   
Dries Buytaert committed
721
  foreach ($args as $key => $value) {
722
    $output .= ' <'. $key .'>'. check_plain($value) ."</$key>\n";
Dries Buytaert's avatar
   
Dries Buytaert committed
723
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
724
725
726
727
728
729
  $output .= $items;
  $output .= "</channel>\n";

  return $output;
}

Dries Buytaert's avatar
   
Dries Buytaert committed
730
731
732
733
734
/**
 * Format a single RSS item.
 *
 * Arbitrary elements may be added using the $args associative array.
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
735
function format_rss_item($title, $link, $description, $args = array()) {
Dries Buytaert's avatar
Dries Buytaert committed
736
  $output = "<item>\n";
737
738
739
  $output .= ' <title>'. check_plain($title) ."</title>\n";
  $output .= ' <link>'. check_url($link) ."</link>\n";
  $output .= ' <description>'. check_plain($description) ."</description>\n";
Dries Buytaert's avatar
   
Dries Buytaert committed
740
  foreach ($args as $key => $value) {
Dries Buytaert's avatar
   
Dries Buytaert committed
741
742
743
    if (is_array($value)) {
      if ($value['key']) {
        $output .= ' <'. $value['key'];
744
        if (isset($value['attributes']) && is_array($value['attributes'])) {
Dries Buytaert's avatar
   
Dries Buytaert committed
745
746
747
748
749
750
751
752
753
754
755
756
          $output .= drupal_attributes($value['attributes']);
        }

        if ($value['value']) {
          $output .= '>'. $value['value'] .'</'. $value['key'] .">\n";
        }
        else {
          $output .= " />\n";
        }
      }
    }
    else {
757
      $output .= ' <'. $key .'>'. check_plain($value) ."</$key>\n";
Dries Buytaert's avatar
   
Dries Buytaert committed
758
    }
Dries Buytaert's avatar
   
Dries Buytaert committed
759
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
760
761
762
763
764
  $output .= "</item>\n";

  return $output;
}

Dries Buytaert's avatar
   
Dries Buytaert committed
765
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
766
 * Format a string containing a count of items.
Dries Buytaert's avatar
   
Dries Buytaert committed
767
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
768
769
770
771
772
773
774
775
776
777
778
779
780
781
 * This function ensures that the string is pluralized correctly. Since t() is
 * called by this function, make sure not to pass already-localized strings to it.
 *
 * @param $count
 *   The item count to display.
 * @param $singular
 *   The string for the singular case. Please make sure it is clear this is
 *   singular, to ease translation (e.g. use "1 new comment" instead of "1 new").
 * @param $plural
 *   The string for the plural case. Please make sure it is clear this is plural,
 *   to ease translation. Use %count in place of the item count, as in "%count
 *   new comments".
 * @return
 *   A translated string.
Dries Buytaert's avatar
   
Dries Buytaert committed
782
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
783
function format_plural($count, $singular, $plural) {
784
  if ($count == 1) return t($singular, array("%count" => $count));
Dries Buytaert's avatar
   
Dries Buytaert committed
785
786

  // get the plural index through the gettext formula
787
  $index = (function_exists('locale_get_plural')) ? locale_get_plural($count) : -1;
Dries Buytaert's avatar
   
Dries Buytaert committed
788
789
790
791
792
793
  if ($index < 0) { // backward compatibility
    return t($plural, array("%count" => $count));
  }
  else {
    switch ($index) {
      case "0":
794
        return t($singular, array("%count" => $count));
Dries Buytaert's avatar
   
Dries Buytaert committed
795
796
797
798
799
800
      case "1":
        return t($plural, array("%count" => $count));
      default:
        return t(strtr($plural, array("%count" => '%count['. $index .']')), array('%count['. $index .']' => $count));
    }
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
801
802
}

Dries Buytaert's avatar
   
Dries Buytaert committed
803
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
804
 * Generate a string representation for the given byte count.
Dries Buytaert's avatar
   
Dries Buytaert committed
805
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
806
807
808
809
 * @param $size
 *   The size in bytes.
 * @return
 *   A translated string representation of the size.
Dries Buytaert's avatar
   
Dries Buytaert committed
810
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
811
function format_size($size) {
Dries Buytaert's avatar
   
Dries Buytaert committed
812
  $suffix = t('bytes');
813
  if ($size >= 1024) {
Dries Buytaert's avatar
   
Dries Buytaert committed
814
    $size = round($size / 1024, 2);
Dries Buytaert's avatar
   
Dries Buytaert committed
815
    $suffix = t('KB');
Dries Buytaert's avatar
   
Dries Buytaert committed
816
  }
817
  if ($size >= 1024) {
Dries Buytaert's avatar
   
Dries Buytaert committed
818
    $size = round($size / 1024, 2);
Dries Buytaert's avatar
   
Dries Buytaert committed
819
    $suffix = t('MB');
Dries Buytaert's avatar
   
Dries Buytaert committed
820
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
821
  return t('%size %suffix', array('%size' => $size, '%suffix' => $suffix));
Dries Buytaert's avatar
   
Dries Buytaert committed
822
823
}

Dries Buytaert's avatar
   
Dries Buytaert committed
824
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
825
 * Format a time interval with the requested granularity.
Dries Buytaert's avatar
   
Dries Buytaert committed
826
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
827
828
829
830
831
832
 * @param $timestamp
 *   The length of the interval in seconds.
 * @param $granularity
 *   How many different units to display in the string.
 * @return
 *   A translated string representation of the interval.
Dries Buytaert's avatar
   
Dries Buytaert committed
833
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
834
function format_interval($timestamp, $granularity = 2) {
Dries Buytaert's avatar
   
Dries Buytaert committed
835
  $units = array('1 year|%count years' => 31536000, '1 week|%count weeks' => 604800, '1 day|%count days' => 86400, '1 hour|%count hours' => 3600, '1 min|%count min' => 60, '1 sec|%count sec' => 1);
Dries Buytaert's avatar
   
Dries Buytaert committed
836
  $output = '';
Dries Buytaert's avatar
   
Dries Buytaert committed
837
  foreach ($units as $key => $value) {
Dries Buytaert's avatar
   
Dries Buytaert committed
838
    $key = explode('|', $key);
Dries Buytaert's avatar
   
Dries Buytaert committed
839
    if ($timestamp >= $value) {
Dries Buytaert's avatar
   
Dries Buytaert committed
840
      $output .= ($output ? ' ' : '') . format_plural(floor($timestamp / $value), $key[0], $key[1]);
Dries Buytaert's avatar
   
Dries Buytaert committed
841
      $timestamp %= $value;
Dries Buytaert's avatar
   
Dries Buytaert committed
842
843
844
845
846
      $granularity--;
    }

    if ($granularity == 0) {
      break;
Dries Buytaert's avatar
   
Dries Buytaert committed
847
848
    }
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
849
  return $output ? $output : t('0 sec');
Dries Buytaert's avatar
   
Dries Buytaert committed
850
851
}

Dries Buytaert's avatar
   
Dries Buytaert committed
852
/**
Dries Buytaert's avatar
   
Dries Buytaert committed
853
854
 * Format a date with the given configured format or a custom format string.
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
855
856
857
858
 * Drupal allows administrators to select formatting strings for 'small',
 * 'medium' and 'large' date formats. This function can handle these formats,
 * as well as any custom format.
 *
Dries Buytaert's avatar
   
Dries Buytaert committed
859
860
861
862
863
864
 * @param $timestamp
 *   The exact date to format, as a UNIX timestamp.
 * @param $type
 *   The format to use. Can be "small", "medium" or "large" for the preconfigured
 *   date formats. If "custom" is specified, then $format is required as well.
 * @param $format
865
866
867
 *   A PHP date format string as required by date(). A backslash should be used
 *   before a character to avoid interpreting the character as part of a date
 *   format.
Dries Buytaert's avatar
   
Dries Buytaert committed
868
869
870
871
 * @param $timezone
 *   Time zone offset in seconds; if omitted, the user's time zone is used.
 * @return
 *   A translated date string in the requested format.
Dries Buytaert's avatar
   
Dries Buytaert committed
872
 */
873
function format_date($timestamp, $type = 'medium', $format = '', $timezone = NULL) {
874
  if (!isset($timezone)) {
875
    global $user;
Steven Wittens's avatar
Steven Wittens committed
876
877
878
879
880
881
    if (variable_get('configurable_timezones', 1) && $user->uid && strlen($user->timezone)) {
      $timezone = $user->timezone;
    }
    else {
      $timezone = variable_get('date_default_timezone', 0);
    }
882
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
883

884
  $timestamp += $timezone;
Dries Buytaert's avatar
   
Dries Buytaert committed
885
886

  switch ($type) {
887
888
    case 'small':
      $format = variable_get('date_format_short', 'm/d/Y - H:i');
Dries Buytaert's avatar
   
Dries Buytaert committed
889
      break;
890
891
    case 'large':
      $format = variable_get('date_format_long', 'l, F j, Y - H:i');
Dries Buytaert's avatar
   
Dries Buytaert committed
892
      break;
893
    case 'custom':
Dries Buytaert's avatar
   
Dries Buytaert committed
894
      // No change to format
Dries Buytaert's avatar
   
Dries Buytaert committed
895
      break;
896
    case 'medium':
Dries Buytaert's avatar
   
Dries Buytaert committed
897
    default:
898
      $format = variable_get('date_format_medium', 'D, m/d/Y - H:i');
Dries Buytaert's avatar
   
Dries Buytaert committed
899
900
  }

901
  $max = strlen($format);
Dries Buytaert's avatar
   
Dries Buytaert committed
902
  $date = '';
Dries Buytaert's avatar
   
Dries Buytaert committed
903
  for ($i = 0; $i < $max; $i++) {
904
    $c = $format[$i];
905
    if (strpos('AaDFlM', $c) !== false) {
906
      $date .= t(gmdate($c, $timestamp));
907
    }
908
    else if (strpos('BdgGhHiIjLmnsStTUwWYyz', $c) !== false) {
909
910
911
912
      $date .= gmdate($c, $timestamp);
    }
    else if ($c == 'r') {
      $date .= format_date($timestamp - $timezone, 'custom', 'D, d M Y H:i:s O', $timezone);
Dries Buytaert's avatar
   
Dries Buytaert committed
913
    }
914
915
916
917
918
    else if ($c == 'O') {
      $date .= sprintf('%s%02d%02d', ($timezone < 0 ? '-' : '+'), abs($timezone / 3600), abs($timezone % 3600) / 60);
    }
    else if ($c == 'Z') {
      $date .= $timezone;
Dries Buytaert's avatar
   
Dries Buytaert committed
919
    }
920
921
922
    else if ($c == '\\') {
      $date .= $format[++$i];
    }
Dries Buytaert's avatar
   
Dries Buytaert committed
923
    else {
924
      $date .= $c;
Dries Buytaert's avatar
   
Dries Buytaert committed
925
    }
Dries Buytaert's avatar
   
Dries Buytaert committed
926
  }
927

Dries Buytaert's avatar
   
Dries Buytaert committed
928
929
930
  return $date;
}

Dries Buytaert's avatar
   
Dries Buytaert committed
931
932
933
/**
 * @} End of "defgroup format".
 */
Dries Buytaert's avatar
   
Dries Buytaert committed
934

Dries Buytaert's avatar
   
Dries Buytaert committed
935
/**
936
 * Generate a URL from a Drupal menu path. Will also pass-through existing URLs.
Dries Buytaert's avatar
   
Dries Buytaert committed
937
938
 *
 * @param $path
939
940
 *   The Drupal path being linked to, such as "admin/node", or an existing URL
 *   like "http://drupal.org/".
Dries Buytaert's avatar
   
Dries Buytaert committed
941
 * @param $query
942
 *   A query string to append to the link or URL.
Dries Buytaert's avatar
   
Dries Buytaert committed
943
 * @param $fragment
944
945
946
 *   A fragment identifier (named anchor) to append to the link. If an existing
 *   URL with a fragment identifier is used, it will be replaced. Note, do not
 *   include the '#'.
Dries Buytaert's avatar
   
Dries Buytaert committed
947
948
 * @param $absolute
 *   Whether to force the output to be an absolute link (beginning with http:).
949
950
 *   Useful for links that will be displayed outside the site, such as in an
 *   RSS feed.
Dries Buytaert's avatar
   
Dries Buytaert committed
951
952
953
954
955
956
957
 * @return
 *   an HTML string containing a link to the given path.
 *
 * When creating links in modules, consider whether l() could be a better
 * alternative than url().
 */
function url($path = NULL, $query = NULL, $fragment = NULL, $absolute = FALSE) {
958
959
960
961
962
963
  if (isset($fragment)) {
    $fragment = '#'. $fragment;
  }

  // Return an external link if $path contains an allowed absolute URL.
  // Only call the slow filter_xss_bad_protocol if $path contains a ':'.
964
  if (strpos($path, ':') !== FALSE && filter_xss_bad_protocol($path, FALSE) == check_plain($path)) {
965
966
967
968
969
970
971
972
973
974
975
976
977
978
    // Split off the fragment
    if (strpos($path, '#')) {
      list($path, $old_fragment) = explode('#', $path, 2);
      if (isset($old_fragment) && !isset($fragment)) {
        $fragment = '#'. $old_fragment;
      }
    }
    // Append the query
    if (isset($query)) {
      $path .= (strpos($path, '?') ? '&' : '?') . $query;
    }
    // Reassemble
    return $path . $fragment;
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
979

980
  global $base_url;
Dries Buytaert's avatar
   
Dries Buytaert committed
981
  static $script;
982
  static $clean_url;
Dries Buytaert's avatar
   
Dries Buytaert committed
983
984

  if (empty($script)) {
Dries Buytaert's avatar
   
Dries Buytaert committed
985
986
987
    // On some web servers, such as IIS, we can't omit "index.php".  So, we
    // generate "index.php?q=foo" instead of "?q=foo" on anything that is not
    // Apache.
Dries Buytaert's avatar
   
Dries Buytaert committed
988
    $script = (strpos($_SERVER['SERVER_SOFTWARE'], 'Apache') === false) ? 'index.php' : '';
Dries Buytaert's avatar
   
Dries Buytaert committed
989
  }
990

991
  // Cache the clean_url variable to improve performance.
992
993
  if (!isset($clean_url)) {
    $clean_url = (bool)variable_get('clean_url', '0');
994
  }
Dries Buytaert's avatar
   
Dries Buytaert committed
995

996
  $base = ($absolute ? $base_url . '/' : base_path());
Dries Buytaert's avatar
Dries Buytaert committed
997

998
999
1000
  // The special path '<front>' links to the default front page.
  if (isset($path) && $path != '<front>') {
    $path = drupal_get_path_alias($path);
For faster browsing, not all history is shown. View entire blame