php使用令牌Token防止表单重复提交

php使用令牌Token防止表单重复提交原理在于生成一个随机字符串放在session里，提交表单后来验证这个字符串，可以做到防止他人自己写form来欺骗提交，重复提交或者双击提交。

/*

* PHP使用token防止表单重复提交

* 此处理方法纯粹是为了给初学者参考

*/

session_start();

function set_token() {

$_SESSION['token'] = md5(microtime(true));

}

function valid_token() {

$return = $_REQUEST['token'] === $_SESSION['token'] ? true : false;

set_token();

return $return;

}

//如果token为空则生成一个token (作者：脚本之家教程 http://www.manongjc.com )

if(!isset($_SESSION['token']) || $_SESSION['token']=='') {

set_token();

}

if(isset($_POST['test'])){

if(!valid_token()){

echo "token error";

}else{

echo '成功提交，Value:'.$_POST['test'];

}

}

?>

上面的比较简单一点的方法，下面的代码更加安全一点。

Token.php

function getToken($len = 32,$md5 = true) {

# Seed random number generator

# Only needed for PHP versions prior to 4.2

mt_srand((double) microtime() * 1000000);

# Array of characters,adjust as desired

$chars = array ('Q','@','8','y','%','^','5','Z','(','G','_','O','`','S','-','N','<','D','{','}','[',']','h',';','W','.','/','|',':','1','E','L','4','&','6','7','#','9','a','A','b','B','~','C','d','>','e','2','f','P','g',')','?','H','i','X','U','J','k','r','l','3','t');

# Array indice friendly number of chars;

$numChars = count($chars) - 1;

$token = '';

# Create random token(作者：脚本之家教程 http://www.manongjc.com/article/1549.html )

for ($i = 0; $i < $len; $i++)

$token .= $chars[mt_rand(0,$numChars)];

# Should token be run through md5?

if ($md5) {

# Number of 32 char chunks

$chunks = ceil(strlen($token) / 32);

$md5token = '';

# Run each chunk through md5

for ($i = 1; $i <= $chunks; $i++)

$md5token .= md5(substr($token,$i * 32 - 32,32));

# Trim the token

$token = substr($md5token,$len);

}

return $token;

}

?>

form.php

include_once("token.php");

$token = getToken();

session_start();

$_SESSION['token'] = $token;

?>

action.php

session_start();

if($_POST['token'] == $_SESSION['token']){

unset($_SESSION['token']);

echo "这是一个正常的提交请求";

}else{

echo "这是一个非法的提交请求";

}

?>

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