3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo md5('test'); echo PHP_EOL; echo md5('testtest'); echo PHP_EOL; echo md5(md5('test')); echo PHP_EOL; echo md5(md5('test') . md5('test')); echo PHP_EOL;

preferences:
49.32 ms | 402 KiB | 5 Q