<?php $array = [ 'a' => 2, 'z' => 2, 'd' => 1 ]; $allowlist = ['a', 'd']; uksort( $array, fn($a, $b) => $array[$b] <=> $array[$a] ?: in_array($b, $allowlist) <=> in_array($a, $allowlist) ); var_export($array);
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