Accessing MySQL from PHP error

I was getting this weird error on Yii:
CDbConnection failed to open the DB connection: SQLSTATE[HY000] [2013] Lost connection to MySQL server at 'reading initial communication packet', system error: 111

If you are accessing MySQL from PHP and both reside on the same server you must use localhost as the server name on the MySQL configuration file. Like this one I had on my Yii application.

On my Yii config/main.php I changed this:
'connectionString' => 'mysql:host=<host_url>;dbname=<db_name>',

For this:
'connectionString' => 'mysql:host=localhost;dbname=<db_name>',

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