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This article introduces the classic verification code of PHP, the content is very detailed, interested friends can refer to, hope to be helpful to you.

We design a verification code class Vcode through the image processing content of PHP's GD library. Declare the class in the file vcode.class.php and encapsulate some implementation details in the class through object-oriented features. As long as you provide three parameters for the constructor when creating the object, including the width and height of the CAPTCHA picture and the number of CAPTCHA letters, you can successfully create an object of the CAPTCHA class. The declaration code for this class is as follows:

The form code is as follows:

Username:

Password:

Code:

Download PHP Classic Verification Code class:

PHP authentication code class .rar

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