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How do I generate a captcha picture? Using the PHP gd? Ok,right. In fact, Zend's CAPTCHA module has been packaged well. This article explains how to use the Zend Captcha module.
Environment installationFirst Zend The captcha need to install GD. See
Verification code is often used for landing pages, message pages, registration page, the principle of verification code is very simple: the use of GD library to create a picture, of course, the image must add the necessary interference code, and
PHP code for simple Verification Code identification, PHP CAPTCHA codes
Always wanted to write this, after a long time today interest came to simply record.
Verification Code
Fully automatic distinguish between computer and human public Turing Test
Implementation of dynamic random verification code mechanism in PHPThe Verification Code (CAPTCHA) is the abbreviation for "Completely Automated public Turing test to tell Computers and humans Apart" (fully automated computer-and human-Turing test),
In PHP to generate verification code picture is quite simple, because in PHP provides us with the graphics Gd.dll Library, to enable the GD graphics library we just put PHP-GD in front of the php.ini;
Method One
The code is as follows
PHP Verification Code implementation codes (3 kinds), PHP captcha Code of 3
Verification code in the form implementation more and more, but with JS write verification code, always feel inconvenient, so learned the next PHP implementation of the
In the actual project development often encounter verification code problems, such as landing page, Message page, registration page ...
The principle of verification code is very simple: the use of the GD library to create a picture, the image of
A simple and secure PHP code class with Call method, PHP verification code attached to the call
Example of a verification code
Second, PHP Verification code class, secoder.class.php
* @link Http://labs.yulans.cn/YL_Security_Secoder * @link
Simple and secure PHP verification code with call method, PHP verification code attached to the call
Example of a verification code
Second, PHP Verification code class, secoder.class.php
* @link Http://labs.yulans.cn/YL_Security_Secoder *
Teach you how to implement verification code PHP, PHP implementation Verification code
Verification code in the form implementation more and more, but with JS write verification code, always feel inconvenient, so learned the next PHP implementation
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