如何在PHP中生成多个数组中项目的所有组合

这是递归解决方案：

function combinations($arrays, $i = 0) {    if (!isset($arrays[$i])) {        return array();    }    if ($i == count($arrays) - 1) {        return $arrays[$i];    }    // get combinations from subsequent arrays    $tmp = combinations($arrays, $i + 1);    $result = array();    // concat each array from tmp with each element from $arrays[$i]    foreach ($arrays[$i] as $v) {        foreach ($tmp as $t) { $result[] = is_array($t) ?      array_merge(array($v), $t) :     array($v, $t);        }    }    return $result;}print_r(    combinations(        array( array('A1','A2','A3'),  array('B1','B2','B3'),  array('C1','C2')        )    ));