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這篇文章將為大家詳細講解有關PHP基于自定義函數生成笛卡爾積的示例分析,小編覺得挺實用的,因此分享給大家做個參考,希望大家閱讀完這篇文章后可以有所收獲。
具體如下:
<?php $color = array('red', 'green'); $size = array(39, 40, 41); $local = array('beijing', 'shanghai'); echo "<pre>"; print_r(combineDika($color, $size, $local)); /** * 所有數組的笛卡爾積 * * @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 < $cnt; $i++) { $result = combineArray($result,$data[$i]); } return $result; } /** * 兩個數組的笛卡爾積 * * @param unknown_type $arr1 * @param unknown_type $arr2 */ function combineArray($arr1,$arr2) { $result = array(); foreach ($arr1 as $item1) { foreach ($arr2 as $item2) { $temp = $item1; $temp[] = $item2; $result[] = $temp; } } return $result; } ?>
運行結果:
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 ) )
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