笛卡尔积

<?php
$a = array('A','B','C','D');
$b = array(1,2,3);
$c = array('@','#');
print_r(combineDika($a,$b,$c));
/**

• 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 < $cnt; $i++) {
    $result = combineArray($result,$data[$i]);
}
return $result;

}

/**

• 两个数组的笛卡尔积
• @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;

}