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<?php
/**
* Elgg installation
* Various functions to assist with installing and upgrading the system
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Curverider Ltd
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* Check that the installed version of PHP meets the minimum requirements (currently 5.2 or greater).
*
* @return bool
*/
function php_check_version()
{
if (version_compare(phpversion(), '5.2.0', '>='))
return true;
return false;
}
/**
* Validate the platform Elgg is being installed on.
*
* @throws ConfigurationException if the validation fails.
* @return bool
*/
function validate_platform()
{
// Get database version
if (!db_check_version())
throw new ConfigurationException(elgg_echo('ConfigurationException:BadDatabaseVersion'));
// Now check PHP
if (!php_check_version())
throw new ConfigurationException(elgg_echo('ConfigurationException:BadPHPVersion'));
// TODO: Consider checking for installed modules etc
return true;
}
/**
* Returns whether or not the database has been installed
*
* @return true|false Whether the database has been installed
*/
function is_db_installed() {
global $CONFIG;
if (isset($CONFIG->db_installed)) {
return $CONFIG->db_installed;
}
$tables = get_db_tables();
if (!$tables) {
return false;
}
$CONFIG->db_installed = true; // Set flag if db is installed (if false then we want to check every time)
return true;
}
/**
* Returns whether or not other settings have been set
*
* @return true|false Whether or not the rest of the installation has been followed through with
*/
function is_installed() {
global $CONFIG;
return datalist_get('installed');
}
/**
* Copy and create a new settings.php from settings.example.php, substituting the variables in
* $vars where appropriate.
*
* $vars is an associate array of $key => $value, where $key is the variable text you wish to substitute (eg
* CONFIG_DBNAME will replace {{CONFIG_DBNAME}} in the settings file.
*
* @param array $vars The array of vars
* @param string $in_file Optional input file (if not settings.example.php)
* @return string The file containing substitutions.
*/
function create_settings(array $vars, $in_file="engine/settings.example.php")
{
$file = file_get_contents($in_file);
if (!$file) return false;
foreach ($vars as $k => $v)
$file = str_replace("{{".$k."}}", $v, $file);
return $file;
}
/**
* Initialisation for installation functions
*
*/
function install_init() {
register_action("systemsettings/install",true);
}
register_elgg_event_handler("boot","system","install_init");
?>
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