PHP表单增加token验证,防止站外及重复提交
token用于常用的表单防止重复提交及站外提交的一个常用的处理方式了,下文我们一起来看一个PHP表单增加token验证,防止站外及重复提交例子。
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。
Token.php
<?php /* * Created on 2013-3-25 * * To change the template for this generated file go to * Window - Preferences - PHPeclipse - PHP - Code Templates */ 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 $chars = array ( 'Q', '@', '8', 'y', '%', '^', '5', 'Z', '(', 'G', '_', 'O', '`', 'S', '-', 'N', '<', 'D', '{', '}', '[', ']', 'h', ';', 'W', '.', '/', '|', ':', '1', 'E', 'L', '4', '&', '6', '7', '#', '9', 'a', 'A', 'b', 'B', '~', 'C', 'd', '>', 'e', '2', 'f', 'P', 'g', ')', '?', 'H', 'i', 'X', 'U', 'J', 'k', 'r', 'l', '3', 't', 'M', 'n', '=', 'o', '+', 'p', 'F', 'q', '!', 'K', 'R', 's', 'c', 'm', 'T', 'v', 'j', 'u', 'V', 'w', ',', 'x', 'I', '$', 'Y', 'z', '*' ); # Array indice friendly number of chars; $numChars = count($chars) - 1; $token = ''; # Create random token at the specified length for ($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, 0, $len); } return $token; } ?>
form.php
<?php include_once("token.php"); $token = getToken(); session_start(); $_SESSION['token'] = $token; ?> <form action="action.php" method="post" <input type="hidden" name="token" value="<?=$token?>" /> <!-- 其他input submit之类的 --> </form> action.php <?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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