No function found in the php development manual.

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You are not a php manual...
The php manual is downloaded here:
Http://php.net/download-docs.php
The Chinese column is the Simplified Chinese manual.
From left to right: a single html file, multiple html files, chm manual, and chm manual with comments.

It seems that you need chm.

The chm document may be outdated.
Go directlyPhp.netSearch for the corresponding function, or use google Search/Baidu searchPhp.net call_user_funcYou can find

You are the user manual of the ThinkPHP framework, not the PHP manual.

Use the search function.
If you still cannot find Baidu

You are the tp framework manual, not the php manual.

You are a domestic MVC software thinkphp.