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<?php
/**
* Piwik - Open source web analytics
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
* @category Piwik
* @package Piwik
*/
namespace Piwik;
/**
* Contains helper methods that can be used to get information regarding the
* server, its settings and PHP settings.
*
* @package Piwik
*/
class SettingsServer
{
/**
* Returns true if the current script execution was triggered misc/cron/archive.php.
*
* Helpful for error handling: directly throw error without HTML (eg. when DB is down).
*
* @return bool
* @api
*/
public static function isArchivePhpTriggered()
{
return !empty($_GET['trigger'])
&& $_GET['trigger'] == 'archivephp';
}
/**
* Returns true if running on Microsoft IIS 7 (or above), false if otherwise.
*
* @return bool
* @api
*/
public static function isIIS()
{
$iis = isset($_SERVER['SERVER_SOFTWARE']) &&
preg_match('/^Microsoft-IIS\/(.+)/', $_SERVER['SERVER_SOFTWARE'], $matches) &&
version_compare($matches[1], '7') >= 0;
return $iis;
}
/**
* Returns true if running on an Apache web server, false if otherwise.
*
* @return bool
* @api
*/
public static function isApache()
{
$apache = isset($_SERVER['SERVER_SOFTWARE']) &&
!strncmp($_SERVER['SERVER_SOFTWARE'], 'Apache', 6);
return $apache;
}
/**
* Returns true if running on a Windows operating system, false if otherwise.
*
* @since 0.6.5
* @return bool
* @api
*/
public static function isWindows()
{
return DIRECTORY_SEPARATOR === '\\';
}
/**
* Returns true if this php version/build supports timezone manipulation
* (e.g., php >= 5.2, or compiled with EXPERIMENTAL_DATE_SUPPORT=1 for
* php < 5.2).
*
* @return bool
* @api
*/
public static function isTimezoneSupportEnabled()
{
return
function_exists('date_create') &&
function_exists('date_default_timezone_set') &&
function_exists('timezone_identifiers_list') &&
function_exists('timezone_open') &&
function_exists('timezone_offset_get');
}
/**
* Returns true if the GD PHP extension is available, false if otherwise.
*
* ImageGraph and sparklines depend on the GD extension.
*
* @return bool
* @api
*/
public static function isGdExtensionEnabled()
{
static $gd = null;
if (is_null($gd)) {
$extensions = @get_loaded_extensions();
$gd = in_array('gd', $extensions) && function_exists('imageftbbox');
}
return $gd;
}
/**
* Raise PHP memory limit if below the minimum required
*
* @return bool true if set; false otherwise
*/
public static function raiseMemoryLimitIfNecessary()
{
$memoryLimit = self::getMemoryLimitValue();
if ($memoryLimit === false) {
return false;
}
$minimumMemoryLimit = Config::getInstance()->General['minimum_memory_limit'];
if (self::isArchivePhpTriggered()
&& Piwik::isUserIsSuperUser()
) {
// archive.php: no time limit, high memory limit
self::setMaxExecutionTime(0);
$minimumMemoryLimitWhenArchiving = Config::getInstance()->General['minimum_memory_limit_when_archiving'];
if ($memoryLimit < $minimumMemoryLimitWhenArchiving) {
return self::setMemoryLimit($minimumMemoryLimitWhenArchiving);
}
return false;
}
if ($memoryLimit < $minimumMemoryLimit) {
return self::setMemoryLimit($minimumMemoryLimit);
}
return false;
}
/**
* Set PHP memory limit
*
* Note: system settings may prevent scripts from overriding the master value
*
* @param int $minimumMemoryLimit
* @return bool true if set; false otherwise
*/
protected static function setMemoryLimit($minimumMemoryLimit)
{
// in Megabytes
$currentValue = self::getMemoryLimitValue();
if ($currentValue === false
|| ($currentValue < $minimumMemoryLimit && @ini_set('memory_limit', $minimumMemoryLimit . 'M'))
) {
return true;
}
return false;
}
/**
* Get php memory_limit (in Megabytes)
*
* Prior to PHP 5.2.1, or on Windows, --enable-memory-limit is not a
* compile-time default, so ini_get('memory_limit') may return false.
*
* @see http://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
* @return int|bool memory limit in megabytes, or false if there is no limit
*/
public static function getMemoryLimitValue()
{
if (($memory = ini_get('memory_limit')) > 0) {
// handle shorthand byte options (case-insensitive)
$shorthandByteOption = substr($memory, -1);
switch ($shorthandByteOption) {
case 'G':
case 'g':
return substr($memory, 0, -1) * 1024;
case 'M':
case 'm':
return substr($memory, 0, -1);
case 'K':
case 'k':
return substr($memory, 0, -1) / 1024;
}
return $memory / 1048576;
}
// no memory limit
return false;
}
/**
* Set maximum script execution time.
*
* @param int $executionTime max execution time in seconds (0 = no limit)
*/
public static function setMaxExecutionTime($executionTime)
{
// in the event one or the other is disabled...
@ini_set('max_execution_time', $executionTime);
@set_time_limit($executionTime);
}
}
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