Issue #3319435 by mcdruid, poker10: Update system requirements (including INSTALL.txt) for D7

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To use SQLite with your Drupal installation, the following requirements must be

met: Server has PHP 5.2 or later with PDO, and the PDO SQLite driver must be

met: Server has PHP 5.3 or later with PDO, and the PDO SQLite driver must be

enabled.

SQLITE DATABASE CREATION

Drupal requires:

- A web server. Apache (version 2.0 or greater) is recommended.

- PHP 5.2.4 (or greater) (http://www.php.net/).

- PHP 5.3.3 (at least, PHP 7.x or greater recommended) (https://www.php.net/).

- One of the following databases:

  - MySQL 5.0.15 (or greater) (http://www.mysql.com/).

  - MariaDB 5.1.44 (or greater) (http://mariadb.org/). MariaDB is a fully

    compatible drop-in replacement for MySQL.

  - Percona Server 5.1.70 (or greater) (http://www.percona.com/). Percona

    Server is a backwards-compatible replacement for MySQL.

  - PostgreSQL 8.3 (or greater) (http://www.postgresql.org/).

  - SQLite 3.3.7 (or greater) (http://www.sqlite.org/).

For more detailed information about Drupal requirements, including a list of

PHP extensions and configurations that are required, see "System requirements"

(http://drupal.org/requirements) in the Drupal.org online documentation.

  - MySQL 5.5 (or greater) (https://www.mysql.com/) or equivalent versions of a

    compatible database such as MariaDB or Percona.

  - PostgreSQL 9.5 (or greater) (https://www.postgresql.org/).

  - SQLite 3.27 (or greater) (https://www.sqlite.org/).

Note that version numbers above represent the minimum versions that Drupal 7 is

routinely tested with. For more detailed information about compatibility with

newer versions (that benefit from support from their maintainers), and

requirements including a list of PHP extensions and configurations that are

required, see "System requirements"

(https://www.drupal.org/docs/7/system-requirements) in the Drupal.org online

documentation.

For detailed information on how to configure a test server environment using a

variety of operating systems and web servers, see "Local server setup"

/**

 * Minimum supported version of PHP.

 */

define('DRUPAL_MINIMUM_PHP', '5.2.4');

define('DRUPAL_MINIMUM_PHP', '5.3.3');

/**

 * Minimum recommended value of PHP memory_limit.

define('MAINTENANCE_MODE', 'install');

// Exit early if running an incompatible PHP version to avoid fatal errors.

if (version_compare(PHP_VERSION, '5.2.4') < 0) {

  print 'Your PHP installation is too old. Drupal requires at least PHP 5.2.4. See the <a href="http://drupal.org/requirements">system requirements</a> page for more information.';

if (version_compare(PHP_VERSION, '5.3.3') < 0) {

  print 'Your PHP installation is too old. Drupal requires at least PHP 5.3.3. See the <a href="https://www.drupal.org/docs/7/system-requirements">system requirements</a> page for more information.';

  exit;

}