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<?php function couple($items) { $a = array(); for ($i = 0, $n = count($items); $i < $n; $i++) for ($j = $i + 1; $j < $n; $j++) $a[] = array($items[$j], $items[$i]); return $a; } var_dump(couple(array(1,2,3))) ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> array(2) { [0]=> int(2) [1]=> int(1) } [1]=> array(2) { [0]=> int(3) [1]=> int(1) } [2]=> array(2) { [0]=> int(3) [1]=> int(2) } }