PHP solution to prevent repeated submission of forms

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PHP+SESSION prevents repeated submission of forms

index.php

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The current form page is_submit is set to 0

SESSION_START(); $_SESSION['is_submit'] = 0;

     

用户名：

     

密   码：

     

E-mail：

     

 

post.php

If the form is submitted, set the current 'is_submit to 1, if post.php is refreshed, then the else code will be executed

SESSION_START(); if (isset($_POST['submit'])) {     if ($_SESSION['is_submit'] == '0') {         $_SESSION['is_submit'] = '1';         echo "代码块，要做的事，代码...<a>返回</a>";     } else {         echo "请不用重复提交<a>PHP+SESSION防止表单重复提交</a>";     } }

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php Introduction to the implementation method of solving repeated submission of forms

[Introduction] Repeated submission is a problem that we often encounter in development, except We use js to prevent repeated submissions of the form, and we can also use php to prevent repeated submissions. Example 1 The code is as follows Copy code

Repeated submission is a problem we often encounter in development. In addition to using js to prevent repeated submission of forms, we can also use php to prevent repeated submission. .

Example 1

<br>Specific principle

session scope variable token to prevent.

1. Open session:

session_start();

2. If there is a form submission

The code is as follows

Copy code

##/*<br> * How to prevent repeated submission of forms in php<br> */<br>session_start();<br>if (empty($_SESSION['ip'])) {// For the first write operation, determine whether the IP address is recorded, so as to know whether to write to the database<br> $_SESSION['ip'] = $_SERVER['REMOTE_ADDR']; //First write, for To pave the way for the subsequent judgment of refreshing or retreating<br> //...........//Writing to the database operation<br>} else {//There is already an operation after the first write, It will no longer be written to the database<br> echo 'Please do not refresh and back off again'; //Write some prompts or other things that have been written<br>}<br>?><br>

The code is as follows	Copy code
if (isset($token))

<br>Token is included in the form in hidden form.

The code is as follows	Copy code
##

3. If the form is submitted repeatedly<br>

The code is as followsCopy code##1.if ($_SESSION["token"] != $token) { 4. Set the token value

2. // Prevent duplicate submission, handle it here 3. // header("location:".$_SERVER['PHP_SELF']); <br>4.} else { <br>5. // Normal form submission, processed here <br>6. // echo "Submitted"; <br>7.}<br><br>

The code is as follows1 .$token = mt_rand(0,1000000);

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Copy code
2.$_SESSION['token'] = $token; <br>

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