This warning basically appears for upgrading you server to PHP 5.5.

Solution 1:
If you don’t want to change your code just add into header below code –
[sourcecode]error_reporting(0);[/sourcecode]
Solution 2:
Update your database connection as like below-
[sourcecode]
try {
$db = new PDO(‘mysql:host=localhost;dbname=your_db_name’, ‘db_user_name’, ‘db_password’);
}
catch (Exception $e) {
echo ‘Error!’;
}
finally {
echo ‘Unexpected exception occurs’;
}
[/sourcecode]