3v4l.org

run code in 500+ PHP versions simultaneously
<?php $arr = [ 0 => ['Peter' => 4], 1 => ['Piper' => 4], 2 => ['picked' => 4], 3 => ['peck' => 4], 4 => ['pickled' => 4], ]; $temp = array_map(function($a){ return key($a); }, $arr); natcasesort($temp); $result = []; foreach($temp as $v){ foreach($arr as $v1){ if($v == key($v1)){ $result[] = $v1; break; } } } print_r($result);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 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 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Array ( [0] => Array ( [peck] => 4 ) [1] => Array ( [Peter] => 4 ) [2] => Array ( [picked] => 4 ) [3] => Array ( [pickled] => 4 ) [4] => Array ( [Piper] => 4 ) )
preferences:
75.37 ms | 1770 KiB | 4 Q