How do I stop a website displaying a 'mysql_connect(): The mysql extension is deprecated' PHP error?

I am having a problem with a PHP website and require assistance if poss.

The site is displaying the following error. I believe that it could be due to the server configuration.

mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead  /var/www/xxxxxxxxxxx_main/includes/common/sql.php  Line 51

Please could anyone help me troubleshoot and resolve this issue?
phaygarthAsked:
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StampelCommented:
If you just intend to hide the message, use a @ in front of the function to suppress warning like :
$con = @mysql_connect(DBHOST, DBUSER, DBPASS);
and test $con return with mysql_error

but if you can, install PDO and use PDO function as instructed to do :)
Loganathan NatarajanLAMP DeveloperCommented:
FYI, old mysql_* functions are deprecated in PHP 5.5 (http://php.net/manual/en/changelog.mysql.php).  Try to avoid using them Or convert into mysqli.

<?php
$link = mysqli_connect('localhost', 'user', 'password', 'dbname');

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ref. http://php.net/manual/en/book.mysqli.php
Julian HansenCommented:
Hiding the message might fix the problem now but as soon as your server is upgraded to 5.5 your website will stop working.

You might want to consider to moving over to mysqli as soon as possible - this can be easy or difficult depending on how your site has been built.

If you use an abstraction layer then the process is simple - you just implement or install a mysqli connector or update your abstraction layer code to use mysqli.

If however you have used native mysql calls throughout your code then you have a lot of manual labour and testing ahead of you.

If you are going to change your code consider using an abstraction layer to connect to mysql.
Ray PaseurCommented:
All PHP functions are documented in the online man pages.  For example, see the large red warning box here:
http://www.php.net/manual/en/function.mysql-connect.php

Here is an article that takes you step-by-step through what you must do:
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/PHP_Databases/A_11177-PHP-MySQL-Deprecated-as-of-PHP-5-5-0.html

The short-term "fix" is not really a fix, but it may help you suppress the messages temporarily while you remediate the code:
<?php
error_reporting(E_WARNING ^ E_DEPRECATED);

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