PHP Development Manual can't find a function.

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That's not your PHP manual ...
The download URL for the PHP manual is here:
http://php.net/download-docs.php
Chinese (Simplified) is a manual for Simplified Chinese.
From left to right are: Single HTML files, multiple HTML files, CHM manuals, and a handbook of CHM reviews.

You look like you need a CHM.

The CHM document may be outdated!
Search directly php.net for the function, or use Google search/Baidu search php.net call_user_func to find out

You're using the thinkphp framework, not the PHP manual.

Please use the search function.
If you still can't find the direct Baidu

You're the TP framework manual, not the PHP manual.

You're a homegrown MVC software thinkphp.

