When php5 is connected to mysql5, why does mysql_connetc not be defined? What should I do?

When php5 is connected to mysql5, why does mysql_connetc not be defined? The development environment is Linux + PHP + mysql. no matter what connection function is used, the undefinedfunction & nbsp prompt is displayed. the code is as follows: $ db = mysqli_connect (& quot; 192.168.0.202 & quot;, & quot; n php5 connection mysql5 prompt mysql_connetc undefined?
The development environment is Linux + PHP + mysql. no matter what connection function is used, the system prompts undefined function.
The code is as follows:
$ Db = mysqli_connect ("192.168.0.202", "netpower", "netpower ");
Is there any other settings ??

------ Solution --------------------
Wrong. it should be $ db = mysql_pconnect ("localhsot", "netpower", "netpower ");
------ Solution --------------------
Corrected mysql-related content in the php. ini file.

For example:
Extension_dir = D: \ PHP \ MySQL... // path of php_mysql.dll
Extension = php_mysql.dll