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run code in 300+ PHP versions simultaneously
<?php $a = array('f' => 0, 'fab' => 1, 'fa' => 2); $a = uksort($this->map, function($a, $b) { $lenA = strlen($a); $lenB = strlen($b); if ($lenA < $lenB) { return -1; } else if ($lenA === $lenB) { return 0; } else if ($lenA > $lenB) { return 1; } }); var_dump($a);

preferences:
35.2 ms | 402 KiB | 5 Q