3v4l.org

run code in 500+ PHP versions simultaneously
<?php echo "0 : "; if (filter_var('0', FILTER_VALIDATE_INT)) { echo "OK\n"; } else { echo "Not OK\n"; } echo "1 : "; if (filter_var('1', FILTER_VALIDATE_INT)) { echo "OK\n"; } else { echo "Not OK\n"; }
Output for 5.5.24 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
0 : Not OK 1 : OK
preferences:
32.45 ms | 1137 KiB | 8 Q