Error in DB while loading WP for first time

I keep on getting this error. I’m installing WordPress on manjaro. I have apache up and running with php and mariadb.

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /srv/http/wordpress/wp-includes/wp-db.php:1658
Stack trace:

#0 /srv/http/wordpress/wp-includes/wp-db.php(631): wpdb->db_connect() 
#1 /srv/http/wordpress/wp-includes/load.php(426): wpdb->__construct() 
#2 /srv/http/wordpress/wp-settings.php(126): require_wp_db()
#3 /srv/http/wordpress/wp-config.php(90): require_once('/srv/http/wordp...') 
#4 /srv/http/wordpress/wp-load.php(37): require_once('/srv/http/wordp...') 
#5 /srv/http/wordpress/wp-blog-header.php(13): require_once('/srv/http/wordp...') 
#6 /srv/http/wordpress/index.php(17): require('/srv/http/wordp...') 
#7 {main} thrown in /srv/http/wordpress/wp-includes/wp-db.php on line 1658