Zend is planning on removing it sometime afte version 5.5.x, if your codebase is small you can modify the code to use PDO or MySQLI. Alternatively, if your codebase is hard to change (or too big to change) and you still want to upgrade your PHP version, you can use wrappers like this: http://www.phpclasses.org/package/8221-PHP-Access-MySQL-databases-using-PDO-wrapper-functions.html
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