这可以帮助您尝试这样

    class Test {
    // holds the combinations


     var $combinations= array(); 



    function getCombinations($batch, $elements, $i)  {
        if ($i >= count($elements)) {
            $this->combinations[] = $batch;
        } else {     
            foreach ($elements[$i] as $element) {
                $this->getCombinations(array_merge($batch, $element), $elements, $i + 1);
            }                       
        }
    }
}  

//测试一下！

$traits = array (
    array(
        array('Happy'),
        array('Sad'),
        array('Angry'),
        array('Hopeful')
    ),
    array(
        array('Outgoing'),
        array('Introverted')
    ),
    array(
        array('Tall'),
        array('Short'),
        array('Medium')
    ),
    array(
        array('Violent'),
        array('Quiet'),
        array('Psychotic')
    ),
    array(
        array('Handsome'),
        array('Plain'),
        array('Ugly')
    )
);

$test = new Test();
$start = array();
$test->getCombinations($start, $traits, 0);   
print_r($test->combinations);