类内部的MySQL连接问题

Question

I have a MySQL class that I use to connect to MySQL. But after doing the upgrade of PHP to 5.4.16, it doesn't work any more. Can anyone help with it?
Below is the code that I use. Whenever I try to connect it gets into the error part.

final class MySQL {
    private $connection;

    public function __construct($hostname, $username, $password, $database) {
            if (!$this->connection = mysql_connect($hostname, $username, $password)) {
            exit('Error: Could not make a database connection using ' . $username . '@' . $hostname);
    }
}

Answer 1

SOLVED : Did the following on command prompt and
setsebool -P httpd_can_network_connect=1

More details here : https://maanasroyy.wordpress.com/2015/06/04/php-cant-connect-to-mysql-with-error-13-but-command-line-can/