Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/wp-db.php:1668
Stack trace:
#0 /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/wp-db.php(632): wpdb->db_connect()
#1 /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/load.php(425): wpdb->__construct('wordpress_c6', 'd8W75vt#DU', 'wordpress_25', 'localhost:3306')
#2 /var/www/vhosts/stanpisa.nl/httpdocs/wp-settings.php(116): require_wp_db()
#3 /var/www/vhosts/stanpisa.nl/httpdocs/wp-config.php(89): require_once('/var/www/vhosts...')
#4 /var/www/vhosts/stanpisa.nl/httpdocs/wp-load.php(37): require_once('/var/www/vhosts...')
#5 /var/www/vhosts/stanpisa.nl/httpdocs/wp-blog-header.php(13): require_once('/var/www/vhosts...')
#6 /var/www/vhosts/stanpisa.nl/httpdocs/index.php(17): require('/var/www/vhosts...')
#7 {main}
  thrown in /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/wp-db.php on line 1668

Fatal error: Uncaught Error: Call to undefined function wp_kses_normalize_entities() in /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/formatting.php:4361
Stack trace:
#0 /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/class-wp-fatal-error-handler.php(190): esc_url('https://wordpre...')
#1 /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/class-wp-fatal-error-handler.php(147): WP_Fatal_Error_Handler->display_default_error_template(Array, false)
#2 /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/class-wp-fatal-error-handler.php(52): WP_Fatal_Error_Handler->display_error_template(Array, false)
#3 [internal function]: WP_Fatal_Error_Handler->handle()
#4 {main}
  thrown in /var/www/vhosts/stanpisa.nl/httpdocs/wp-includes/formatting.php on line 4361