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run code in 300+ 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); } ?>

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51.26 ms | 402 KiB | 5 Q