Anti-malicious click system PHP anti-malicious refresh implementation code

Copy the code The code is as follows:

session_start();
$k=$_GET['k'];
$t=$_GET['t'];
$allowTime = 1800; // Anti-refresh time
$ip = get_client_ip();
$allowT = md5($ip.$k.$t);
if(!isset($_SESSION[$allowT]))
{
$refresh = true;
$_SESSION[$allowT] = time();
}elseif(time() - $_SESSION[$allowT]>$allowTime){
$refresh = true;
$_SESSION[$allowT] = time ();
}else{
$refresh = false;
}
?>

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