PhpStorm热键不适用于内部php函数

PhpStorm hotkey for "function parameter info" is Ctrl + P.

I get info when I use this hotkey on my function.

But I don't get info when I use it on internal php functions like preg_match, str_replace and others.

What is the problem ? Thanks in advance.

P.S. PhpStorm version is 7.1.3.