循环数组取值效率问题
如图所示 三维数组
好的。。那么。问题来了。。
如果想删除所有第三层里的seeAnalysis这个键值
正常是用两个foreach,到第三层然后unset
可是就有效率问题
第三层数组可能有数千个之多
那末。。有什么提高效率的办法吗~
回复内容:
如图所示 三维数组
好的。。那么。问题来了。。
如果想删除所有第三层里的seeAnalysis这个键值
正常是用两个foreach,到第三层然后unset
可是就有效率问题
第三层数组可能有数千个之多
那末。。有什么提高效率的办法吗~
为何不换一种思路呢?
你拿着数组是为了什么?还不是为了模板展现,
你在模板展现的时候,是不是需要遍历?
那么,你在模板遍历的时候,先判断seeAnalysis,根据条件忽略不就行了?
<code>php</code><code>bool array_walk_recursive ( array &$input , callable $funcname [, mixed $userdata = NULL ] ) </code>
看一个例子:
<code>php</code><code><?php /** * http://uk1.php.net/array_walk_recursive implementation that is used to remove nodes from the array. * * @param array The input array. * @param callable $callback Function must return boolean value indicating whether to remove the node. * @return array */ function walk_recursive_remove (array $array, callable $callback) { foreach ($array as $k => $v) { if (is_array($v)) { $array[$k] = walk_recursive_remove($v, $callback); } else { if ($callback($v, $k)) { unset($array[$k]); } } } return $array; } ?> </code>

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