PHP Connection MySQL Error configuration method

Let's test it on the books. PHP connection MySQL

The code is as follows

<?php
$link =mysql_connect (' localhost ', ' root ', ' 123456 ');
if (! $link) echo "Failed!";
else echo "Success!";
Mysql_close ();
?>

Run code appears:

Call to undefined function ' mysql_connect () ' ...

Mistakes, failures.

Baidu found the result is Php+mysql environment is not configured well, php5 default MYSQL is closed

Copy Php_mysql.dll and Libmysql.dll files to C:/winnt/system32 (I missed Libmysql.dll)

To find in the php.ini; Extension=php_mysql, remove the front ";"