3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array ( 24 => 24, 25 => 25, 26 => 26, 27 => 27, 28 => 28, 29 => 29, ); $min = min($array) - 1; $max = max($array) + 1; $array[$min] = $min; $array[$max] = $max; print_r($array);

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31.25 ms | 406 KiB | 5 Q