PHP error happened

Technical information
Error type8192
Error descriptionmysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead
URLfergusonblog.org/volunteerspublic/volunteer_at_the_ferguson_libra_add.php?
Error file/home2/ferguso3/public_html/volunteerspublic/include/dbconnection.php
Error line9
SQL query