<?php $array1 = [1, 3, 3, 3, 4, 7, 7, 8, 8]; $array2 = [0, 3, 3, 4, 4, 9, 9, 9]; $counts1 = array_count_values($array1); $counts2 = array_count_values($array2); $result = []; foreach ($counts1 + $counts2 as $num => $cnt) { array_push( $result, ...array_fill( 0, max($counts1[$num] ?? 0, $counts2[$num] ?? 0), $num ) ); } var_export($result);
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