- Patch #770838 by sdboyer: optimize DatabaseConnection::ExpandArguments.

includes/database/database.inc

@@ -213,7 +213,7 @@ abstract class DatabaseConnection extends PDO {
 
   /**
    * Index of what driver-specific class to use for various operations.
-   * 
+   *
    * @var array
    */
   protected $driverClasses = array();
@@ -592,36 +592,33 @@ public function query($query, array $args = array(), $options = array()) {
   protected function expandArguments(&$query, &$args) {
     $modified = FALSE;
 
-    foreach ($args as $key => $data) {
-      // If the placeholder value to insert is an array, assume that we need
-      // to expand it out into a comma-delimited set of placeholders.
-      if (is_array($data)) {
-        $new_keys = array();
-        foreach ($data as $i => $value) {
-          // This assumes that there are no other placeholders that use the same
-          // name.  For example, if the array placeholder is defined as :example
-          // and there is already an :example_2 placeholder, this will generate
-          // a duplicate key.  We do not account for that as the calling code
-          // is already broken if that happens.
-          $new_keys[$key . '_' . $i] = $value;
-        }
-
-        // Update the query with the new placeholders.
-        // preg_replace is a little bit slower than str_replace, but it is
-        // necessary to ensure the replacement does not affect placeholders
-        // that start with the same exact text. For example, if the query
-        // contains the placeholders :foo and :foobar, and :foo has an array
-        // of values, using str_replace would affect both placeholders, but
-        // using the following preg_replace would only affect :foo because it
-        // is followed by a non-word character.
-        $query = preg_replace('#' . $key . '\b#', implode(', ', array_keys($new_keys)), $query);
-
-        // Update the args array with the new placeholders.
-        unset($args[$key]);
-        $args += $new_keys;
-
-        $modified = TRUE;
+    // If the placeholder value to insert is an array, assume that we need
+    // to expand it out into a comma-delimited set of placeholders.
+    foreach (array_filter($args, 'is_array') as $key => $data) {
+      $new_keys = array();
+      foreach ($data as $i => $value) {
+        // This assumes that there are no other placeholders that use the same
+        // name.  For example, if the array placeholder is defined as :example
+        // and there is already an :example_2 placeholder, this will generate
+        // a duplicate key.  We do not account for that as the calling code
+        // is already broken if that happens.
+        $new_keys[$key . '_' . $i] = $value;
       }
+
+      // Update the query with the new placeholders.
+      // preg_replace is necessary to ensure the replacement does not affect
+      // placeholders that start with the same exact text. For example, if the
+      // query contains the placeholders :foo and :foobar, and :foo has an 
+      // array of values, using str_replace would affect both placeholders,
+      // but using the following preg_replace would only affect :foo because
+      // it is followed by a non-word character.
+      $query = preg_replace('#' . $key . '\b#', implode(', ', array_keys($new_keys)), $query);
+
+      // Update the args array with the new placeholders.
+      unset($args[$key]);
+      $args += $new_keys;
+
+      $modified = TRUE;
     }
 
     return $modified;