3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('TEST_CONST', true); $f1 = function() { return extension_loaded('pdo'); }; $f2 = function() { return TEST_CONST; }; $f1(); $f2(); extension_loaded('pdo'); TEST_CONST;
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
preferences:
207.24 ms | 404 KiB | 243 Q