回复内容：
你那个不是php手册。。。
php手册的下载网址在这：
http://php.net/download-docs.php
Chinese (Simplified)那一栏是简体中文的手册。
从左到右分别是：单个的html文件，多个html文件，chm手册，chm带评论的手册。
看你的样子应该是需要chm的。
chm 文档可能会过时哦
直接去php.net 搜索相应函数，或者使用google 搜索 / 百度搜索 php.net call_user_func 就能查到了
你这是ThinkPHP框架的使用手册，不是PHP手册
请用搜索功能。
如果还找不到直接百度
你那个是tp框架手册，不是php手册
你这个是国产的 MVC 软件 thinkphp
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