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PHP anti-Malicious Refresh code Instance

Source: Internet
Author: User
Keywords Web Programming PHP Tutorials
Tags anti- code example ip php php tutorial programming session_start
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Anti-malicious refreshing PHP Tutorial Instance code is very instance, we often in order to prevent some of the user against malicious users to refresh the following let's take a look at this example code.

<?php
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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