3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(); $b = array(1); $c = null; $d = 1; echo is_array($a) ? 'T' : 'F'; echo is_array($b) ? 'T' : 'F'; echo is_array($c) ? 'T' : 'F'; echo is_array($d) ? 'T' : 'F';
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
TTFF
preferences:
140.8 ms | 404 KiB | 181 Q