When Ajax submits a form, the verification code automatically verifies the php backend verification code detection, and the ajax backend
This article uses the source code to demonstrate how to update the verification code before submitting a form. If the verification code is incorrect, the system does not submit the form.
1. Front-end codeIndex.html
<! DOCTYPE html>
2. backend verification code detectionCheckcode. php
<? Php/*** user verification code file * @ Author: Zjmainstay * @ version: 1.0 * @ creatdate: 2013-10-4 */session_start (); echo json_encode (array ('status' => (int) ($ _ SESSION ["CHECKCODE"] == _ POST ['code']); exit;
Source code: Ajax automatically verifies the verification code when submitting a form
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