3v4l.org

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<?php $array1 = [29, 'a', 'x', 'c', 11]; $array2 = ['a' => 20, 'x' => 21, 'c' => 23]; var_export( array_map(fn($v) => $array2[$v] ?? $v, $array1) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 0 => 29, 1 => 20, 2 => 21, 3 => 23, 4 => 11, )

preferences:
139.18 ms | 402 KiB | 123 Q