求教怎么合并数组

求教如何合并数组

<br />
//比如下面两个数组<br />
$a1=array(2=>array(1,2),3=>array(4));<br />
$a2=array(2=>array(5),5=>array(4));<br />
/**<br />
*我想$a1跟$a2合并的结果为 array(2=>array(1,2,5),3=>array(4),5=>array(4));<br />
**/<br />

有什么好的方法？

分享到：

------解决方案--------------------

<br />
$keys = array_unique(array_keys(array_merge($arr1, $arr2)));<br />
foreach($keys as $k) {<br />
 .....<br />
}<br />
<br />

------解决方案--------------------
如果不考虑更进一步的递归 每次都是两个二维数组合并的话 直接写个循环然后array_merge如何?
------解决方案--------------------
楼上正解。。。
------解决方案--------------------

$a1 = array(2=>array(1,2),3=>array(4));<br />
$a2 = array(2=>array(5),5=>array(4));<br />
<br />
foreach($a2 as $k=>$v) {<br />
  if(isset($a1[$k])) $a1[$k] = array_merge($a1[$k], $v);<br />
  else $a1[$k] = $v;<br />
}<br />
print_r($a1);<br />

Array
(
    [2] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 5
        )

    [3] => Array
        (
            [0] => 4
        )

    [5] => Array
        (
            [0] => 4
        )

)

Related labels：

array gt keys merge nbsp

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