这句话翻译一下，怎么理解
这句话翻译一下，如何理解
in_array($_GET['act'],array_keys($output['search_type']))
感觉有点绕，如何理解？
------解决思路----------------------
array_keys($output['search_type'])获取$output['search_type']这个数组里面所有键然后组成一个新数组
in_array($_GET['act'],array_keys($output['search_type']))判断$_GET['act']这个值在不在新数组里面
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