Починить WP после обновления версии PHP

Нужно устранить ошибку
Fatal error: Uncaught Error: Call to undefined function mysql_escape_string() in /home/httpd/vhosts/imperhans.ru/httpdocs/wp-content/themes/gambit/functions.php:60 Stack trace: #0 /home/httpd/vhosts/imperhans.ru/httpdocs/wp-settings.php(497): include() #1 /home/httpd/vhosts/imperhans.ru/httpdocs/wp-config.php(94): require_once('/home/httpd/vho...') #2 /home/httpd/vhosts/imperhans.ru/httpdocs/wp-load.php(37): require_once('/home/httpd/vho...') #3 /home/httpd/vhosts/imperhans.ru/httpdocs/wp-admin/admin.php(34): require_once('/home/httpd/vho...') #4 /home/httpd/vhosts/imperhans.ru/httpdocs/wp-admin/post.php(12): require_once('/home/httpd/vho...') #5 {main} thrown in /home/httpd/vhosts/imperhans.ru/httpdocs/wp-content/themes/gambit/functions.php on line 60