silverstripe-framework/Dev/Install/install.php

<?php

/************************************************************************************
 ************************************************************************************
 **                                                                                **
 **  If you can read this text in your browser then you don't have PHP installed.  **
 **  Please install PHP 5.5.0 or higher.                                           **
 **                                                                                **
 ************************************************************************************
 ************************************************************************************/

/**
 * PHP version check. Make sure we've got at least PHP 5.5.0 in the most friendly way possible
 */
define('FRAMEWORK_NAME', 'framework');

if (version_compare(phpversion(), '5.5.0', '<')) {
	header($_SERVER['SERVER_PROTOCOL'] . " 500 Server Error");
	echo str_replace(
		array('$PHPVersion', 'sapphire'),
		array(phpversion(), FRAMEWORK_NAME),
		file_get_contents(FRAMEWORK_NAME . "/Dev/Install/php5-required.html"));
	die();
}

include(FRAMEWORK_NAME . '/Dev/Install/install.php5');