Erro Grotesco

Preciso de ajuda, já tentei varias formas e nada;

	 

	**Fatal error**: Uncaught Error: Call to undefined function mysql_connect() in C:\xampp\htdocs\wwwroot\inc\preferences.php:8 Stack trace: #0 C:\xampp\htdocs\wwwroot\index.php(3): require() #1 {main} thrown in **C:\xampp\htdocs\wwwroot\inc\preferences.php** on line **8**

	 

	 

	**header("Content-Type:text/html; charset=utf8");

	define("SQL_HOST", "180.101.45.218");

	define("SQL_USER", "root");

	define("SQL_PASS", "lsrpmahonexiaodou");

	define("SQL_DB", "lsrp");**

	 

	 

	**mysql_connect(SQL_HOST, SQL_USER, SQL_PASS) or die(mysql_error());

	mysql_select_db(SQL_DB);**