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<?php // PHP_VERSION_ID is available as of PHP 5.2.7, if our // version is lower than that, then emulate it if (!defined('PHP_VERSION_ID')) { $version = explode('.', PHP_VERSION); define('PHP_VERSION_ID', ($version[0] * 10000 + $version[1] * 100 + $version[2])); } // PHP_VERSION_ID is defined as a number, where the higher the number // is, the newer a PHP version is used. It's defined as used in the above // expression: // // $version_id = $major_version * 10000 + $minor_version * 100 + $release_version; // // Now with PHP_VERSION_ID we can check for features this PHP version // may have, this doesn't require to use version_compare() everytime // you check if the current PHP version may not support a feature. // // For example, we may here define the PHP_VERSION_* constants thats // not available in versions prior to 5.2.7 if (PHP_VERSION_ID < 50207) { define('PHP_MAJOR_VERSION', $version[0]); define('PHP_MINOR_VERSION', $version[1]); define('PHP_RELEASE_VERSION', $version[2]); // and so on, ... }