Wordpress Fatal error: Uncaught Error: Call to und

Question

I am in big trouble. I installed a nulled version of woocommerce cart based shipping plugin and i found it not relevant according to my requiremnet and deleted that plugin from plugins area. After deleting that plugin my site went down. Its continuously showing me Fatal error:

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /home/dev/public_html/new/wp-includes/wp-db.php:1570 Stack trace: #0 /home/dev/public_html/new/wp-includes/wp-db.php(658): wpdb->db_connect() #1 /home/dev/public_html/new/wp-includes/load.php(404): wpdb->__construct('dev_test', '3CrSPh8o766F', 'dev_test_ne...', 'localhost') #2 /home/dev/public_html/new/wp-settings.php(107): require_wp_db() #3 /home/dev/public_html/new/wp-config.php(82): require_once('/home/dev/p...') #4 /home/dev/public_html/new/wp-load.php(37): require_once('/home/dev/p...') #5 /home/dev/public_html/new/wp-blog-header.php(13): require_once('/home/dev/p...') #6 /home/dev/public_html/new/index.php(17): require('/home/dev/p...') #7 {main} thrown in /home/dev/public_html/new/wp-includes/wp-db.php on line 1570

I tried replacing all core files excluding wp-config.php and wp-content folder. Still I am getting the same error.

Also, i tried renameing plugins folder but the error is there.

Can you guys suggest me how i can get my site back.

Answer 1

It happens for me when I switch from 5.6 php to 7.0.

Just enable "mysqli" in your select php version if you use cPanel.

Answer 2

The error seems be simple, mysql_* functions are not enabled. Check with phpinfo() if these functions are truly disabled, and if yes, enable it. If no, there are some problems in the code that you are using, but if you have replaced all files as you write, is most probably the first option.

Answer 3

Possible error sources:

• Since PHP 7, mysql_* functions have been removed, see PHP's official overview of the MySQL drivers.
• You use PHP 5.x and have not enabled the mysql extension, but mysqli and/or pdo_mysql instead.

You can set

define('WP_USE_EXT_MYSQL', true);

in your wp-config.php file to make WordPress use the mysqli extension.