如何在PHP程序中防止盗链_[PHP教程]

example:

页面: dl.php
--------------------------------------------------------------------------------------

id = _GET['id'];
act = _GET['act'];

switch(act) {
default :
case "display" : displayHTML(); break;
case "down" : down(); break;
}

function displayHTML(id) {
setcookie("visited", "true");

// print your HTML.
}

function down(id) {
if(! isset(_COOKIE['visited']) ) print "你盗联?";

sql = "select path from TABLE where id=". id;
//..............................
}
?>

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