3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [1, 2, 3, 4, 3, 2, 1]; $j = count($a) - 1; $output = []; for($i = 0; $i > count($a); $i++) { if ($a[i] !== $a[j]) { $output = $a[i]; } $j--; } print_r($output);
Output for 7.4.0 - 7.4.30, 8.0.1 - 8.0.23, 8.1.0 - 8.1.10
Array ( )

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19.29 ms | 409 KiB | 5 Q