Useful PHP verification code library

12 Jul 2016

In php, GD library is used for verification code, and phpgd library is used for verification code. Use GD library to do verification code in php, phpgd library verification code php require_once 'string.func.php';//Use GD library to do verification code/** *Add verification text* @param int $type * @param int $length */function

25 Jul 2016

Example of php verification code (GD library generates verification code)

11 May 2023

With the development of the Internet, more and more websites need to use verification codes to prevent malicious registration, crawlers and other behaviors. Image verification code is a common form of verification code. It displays an image containing random characters or numbers, allowing users to enter the correct verification code before proceeding to the next step. This article will introduce how to use PHP and GD library to generate image verification codes. The GD library is an image processing library that can be used to generate, process and manipulate various image formats. PHP already has a built-in GD library and provides many functions for creating and manipulating graphs

25 Jul 2016

Example of generating verification code by php GD library

29 Jul 2016

php, verification code: php complete verification code code: <?php require_once 'string.func.php';//Verification code through GD library/***Add verification text* @param int $type* @param int $length */function buildRandomString($type=1,$length=4){$row='';if($type==1){$row=join('',range(0, 9));}elseif( $

29 Jul 2016

Library management system source code: Library management system source code php Generate random verification code image code: Copy the code as follows: <?php /** Default homepage**/ class DefaultController extends AppController { public function index() { $len = 5 ; $str = "ABCDEFGHIJKLNMPQRSTUVWXYZ123456789"; $im = imagecreatetruecolor ( 70, 20 );