Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /home/observa3/public_html/wp-includes/wp-db.php:1645
Stack trace:
#0 /home/observa3/public_html/wp-includes/wp-db.php(639): wpdb->db_connect()
#1 /home/observa3/public_html/wp-includes/load.php(427): wpdb->__construct('username_here', 'password_here', 'database_name_h...', 'localhost')
#2 /home/observa3/public_html/wp-settings.php(120): require_wp_db()
#3 /home/observa3/public_html/wp-config-sample.php(90): require_once('/home/observa3/...')
#4 {main}
thrown in /home/observa3/public_html/wp-includes/wp-db.php on line 1645