3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = ['cat', 'dog', 'horse']; $a =& $array[2]; $a = $array[0]; echo "$a\n"; $a = $array[1]; echo "$a\n"; $a = $array[2]; echo "$a\n";
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
cat dog dog

preferences:
74.47 ms | 1434 KiB | 4 Q