在PHP上保存列表中的特定组合？

$combos = array();

$list = [1, 2, 3, 4, 5];
$target = 6;

for ($i = 0; $i < count($list); $i++) {
    for ($j = $i + 1; $j < count($list); $j++) {
        if ($list[$i] + $list[$j] == $target) {
            $combos[] = [$list[$i], $list[$j]];
        }
    }
}

foreach ($combos as $combo) {
    echo implode(', ', $combo) . "\n";
}