Introduces a classic PHP verification code class sharing. This article not only provides the class code, but also provides usage examples and methods used in the form.
We use PHP's GD library to image process content and design a verification code class Vcode. Declare this class in the file vcode.class.php, and encapsulate some implementation details in this class through object-oriented features. As long as you provide three parameters to the construction method when creating the object, including the width and height of the verification code image and the number of verification code letters, you can successfully create an object of the verification code class. In script code.php, use session_start() to enable user session control, then include the file vcode.class.php where the verification code class Vcode is located, create an object of this type and output it directly. You can send a randomly generated verification code image, and the verification code string will be automatically saved in the server.
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