PHP基于自定义函数生成笛卡尔积的方法示例

<?php
  $color = array('red', 'green');
  $size = array(39, 40, 41);
  $local = array('beijing', 'shanghai');
  echo "<pre>";
  print_r(bineDika($color, $size, $local));
  /
    所有数组的笛卡尔积
   
    @param unknown_type $data
   /
  function bineDika() {
    $data = func_get_args();
    $t = count($data);
    $result = array();
    foreach($data[0] as $item) {
      $result[] = array($item);
    }
    for($i = 1; $i < $t; $i++) {
      $result = bineArray($result,$data[$i]);
    }
    return $result;
  }
  /
    两个数组的笛卡尔积
   
    @param unknown_type $arr1
    @param unknown_type $arr2
   /
  function bineArray($arr1,$arr2) {
    $result = array();
    foreach ($arr1 as $item1) {
      foreach ($arr2 as $item2) {
        $temp = $item1;
        $temp[] = $item2;
        $result[] = $temp;
      }
    }
    return $result;
  }
?>

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
    )
)