3v4l.org

run code in 500+ PHP versions simultaneously
<?php $mode[0] = array(1, 2, 5, 6); $mode[1] = array(3, 4, 7, 8); for($i=0;$i<2;$i++) { $flipped = array_flip($mode[$i]); print_r($flipped); } ?>
Output for 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.23, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
Array ( [1] => 0 [2] => 1 [5] => 2 [6] => 3 ) Array ( [3] => 0 [4] => 1 [7] => 2 [8] => 3 )
preferences:
99.23 ms | 1653 KiB | 4 Q