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<?php $arr = [1, 4, 8, 16, 23, 42]; $order = [4, 42, 16]; usort( $arr, function($a, $b) use($order) { $o = in_array($a, $order)<=>in_array($b, $order); if ($o === 0 ) $o = $a<=>$b return $o; } ); print_r($arr);
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