PHP cant connect to MySQL

Question

$link = mysql_connect(\'localhost\', $username, $password);
if (!$link) 
{
     die(\'Could not connect: \' . mysql_error());
}

I get this error:

Answer 1

Your $password variable is empty ((using password: NO)) then you trying log into www-data user without password, and server result is access denied. Propably this user have setted password.