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run code in 300+ PHP versions simultaneously
<?php $start = microtime(true); for($i = 1; $i <= 10000; $i++) { if(function_exists('mcrypt_encrypt')) { $bool = true; } else { $bool = false; } } $end = microtime(true); echo 'function_exists: '.($end - $start); echo PHP_EOL; $start = microtime(true); for($i = 1; $i <= 10000; $i++) { if(extension_loaded('mcrypt')) { $bool = true; } else { $bool = false; } } $end = microtime(true); echo 'extension_loaded: '.($end - $start);

preferences:
33.14 ms | 406 KiB | 5 Q