3v4l.org

run code in 300+ PHP versions simultaneously
<?php foreach ([NULL, '', 0, '0'] as $val) { echo var_export(is_numeric($val), TRUE) . PHP_EOL; }
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
false false true true
preferences:
110.61 ms | 1941 KiB | 4 Q