<?php
#demo for prevent csrf
/**
* enc
*/
function encrypt($token_time) {
return md5(‘!@##$@$$#%43′ . $token_time);
}
$token_time = time();
$token = encrypt($token_time);
$expire_time = 10;
if ($_POST) {
$_token_time = $_POST['token_time'];
$_token = $_POST['token'];
if ((time() – $_token_time) > $expire_time) {
echo “expired token”;
echo “<br />”;
}
echo $_token;
echo “<br />”;
$_token_real = encrypt($_token_time);
echo $_token_real;
//compare $_token and $_token_real
}
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv=”content-type” content=”text/html; charset=utf-8″ />
<title>test for csrf</title>
<meta http-equiv=”" content=”" />
</head>
<body>
<form method=”post” action=”">
<input type=”text” name=”text” id=”" value=”hello” />
<input type=”hidden” name=”token” id=”" value=”<?php echo $token ?>” />
<input type=”hidden” name=”token_time” id=”" value=”<?php echo $token_time ?>” />
<input type=”submit” name=”submit” id=”" value=”submit” />
</form>
</body>
</html>
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