PHP自定义函数生成笛卡尔积

<?php $color = array(&#39;red&#39;, &#39;green&#39;);
	$size = array(39, 40, 41);
	$local = array(&#39;beijing&#39;, &#39;shanghai&#39;);
	
	echo "<pre class="brush:php;toolbar:false">";
	print_r(combineDika($color, $size, $local));
	
	/**
	 * 所有数组的笛卡尔积
	 *
	 * @param unknown_type $data
	 */
	function combineDika() {
		$data = func_get_args();
		$cnt = count($data);
		$result = array();
		foreach($data[0] as $item) {
			$result[] = array($item);
		}
		for($i = 1; $i 

Array
(
    [0] => Array
        (
            [0] => red
            [1] => 39
            [2] => beijing
        )

    [1] => Array
        (
            [0] => red
            [1] => 39
            [2] => shanghai
        )

    [2] => Array
        (
            [0] => red
            [1] => 40
            [2] => beijing
        )

    [3] => Array
        (
            [0] => red
            [1] => 40
            [2] => shanghai
        )

    [4] => Array
        (
            [0] => red
            [1] => 41
            [2] => beijing
        )

    [5] => Array
        (
            [0] => red
            [1] => 41
            [2] => shanghai
        )

    [6] => Array
        (
            [0] => green
            [1] => 39
            [2] => beijing
        )

    [7] => Array
        (
            [0] => green
            [1] => 39
            [2] => shanghai
        )

    [8] => Array
        (
            [0] => green
            [1] => 40
            [2] => beijing
        )

    [9] => Array
        (
            [0] => green
            [1] => 40
            [2] => shanghai
        )

    [10] => Array
        (
            [0] => green
            [1] => 41
            [2] => beijing
        )

    [11] => Array
        (
            [0] => green
            [1] => 41
            [2] => shanghai
        )

)