link_mysql的php版

<?php
$str_sql_read="select count(*) as num from userinfo";
$str_sql_del="delete from userinfo where id =1";
$res =link_mysql("read",$str_sql_read);
$res_del =link_mysql("delete",$str_sql_del);
echo $res_del."<br/>";
while($row = mysql_fetch_assoc($res))
{
	echo "<font style='font-size:25px;color:red;'>".$row['num']."</font><br/>";
}

?>

<?php
function link_mysql($opt,$str_sql)
{
	$con = mysql_connect("localhost","root","root") or die ('Not connected : ' . mysql_error());
	mysql_set_charset("gbk",$con);
	//if you donot know how to use this function,find it defination;
	mysql_select_db("website",$con);
	switch($opt){
		case "read":
			$res =mysql_query($str_sql);
		break;
		case "update":
		case "delete":
		case "insert":
			$res =mysql_query($str_sql);
		break;
	}
	mysql_close();
	return $res;
}
?>