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<?php $a = ['a', 'b', 'c']; $b = [ 23 => 'x', 'y', 'z' ]; $c = array_merge($a, $b); $d = $a + $b; print_r(compact('a', 'b', 'c', 'd')); $a = ['a' => 'a', 'b' => 'b', 'c' => 'c']; $b = [ 23 => 'x', 'y', 'z' ]; $c = array_merge($a, $b); $d = $a + $b; print_r(compact('a', 'b', 'c', 'd'));

preferences:
25.17 ms | 406 KiB | 5 Q