3v4l.org

run code in 500+ PHP versions simultaneously
<?php var_dump(filter_var('0x', FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)); var_dump(filter_var('0X', FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)); var_dump(filter_var('', FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)); var_dump(filter_var('0', FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX));

preferences:
22.43 ms | 477 KiB | 4 Q