How to use token in PHP to prevent repeated submission of forms, token form_PHP tutorial

How PHP uses token to prevent repeated submission of forms, token form

This article describes the example of how PHP uses token to prevent repeated submission of forms. Share it with everyone for your reference, the details are as follows:

<&#63;php
/*
* 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'] &#63; true : false;
  set_token();
  return $return;
}
//如果token为空则生成一个token
if(!isset($_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'];
  }
}
&#63;>
<form method="post" action="">
  <input type="hidden" name="token" value="<&#63;php echo $_SESSION['token']&#63;>">
  <input type="text" name="test" value="Default">
  <input type="submit" value="提交" />
</form>

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