Ok so the code has been deprecated
return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $this->_key, $plaintext, MCRYPT_MODE_CBC, $this->_iv)).sprintf('%06d', $length);
Any ideas on what should replace it?
Or I can change the PHP version to 5.6, would this have any adverse effects to my site?
Many thanks
Jamie