[php verification code class] Share 10 useful php verification code codes

Verification code is indispensable in PHP websites. It can prevent malicious registration or submission, malicious password cracking, ticket fraud, forum flooding, page brushing, etc. Verification code can also reduce server pressure. Let’s share on PHP Chinese website 10 useful PHP verification code classes for you to download and use.

1.Beautiful php verification code class: Share a beautiful php verification code class. Usage: 1. First save the verification code class as a file named ValidateCode.class.php; 2. Create a new file named captcha.php to call the class.

2. PHP verification code class that supports numbers, letters, Chinese characters, and mixed : Give you a PHP verification code class that supports numbers, letters, Chinese characters, and mixed characters. The objects of this class can dynamically obtain verification code images, and the verification code characters are saved in In SESSION['code'], 4 formats of mixed numbers, letters and Chinese characters are supported.

3.php high-security verification code generation class: Introducing a PHP high-security verification code generation program. This generation program needs to call some font libraries. You can call the ones that come with your system. For some fonts, of course, you can also put the fonts in a directory yourself like dedecms, so that they can also be used on the server.

4.PHP verification code class that supports Chinese alphanumeric and custom fonts: Verification codes are often used on login pages, message pages, and registration pages. The principle of verification codes is very simple: use GD The library creates a picture. Of course, the picture must be added with the necessary interference code, and then stored in the SESSION on the server side. When the user submits, it will be judged whether the sessions are the same.

5.Customized PHP verification code code: a customized PHP verification code code, image object, width, height, verification code length, random string, y-axis Coordinate values, random colors, background colors of red, green and blue, the default is light gray, verification code length, image width, height are required data when instantiating the class, set the image background color, the default is light gray background.

6.php implements a simple and practical verification code class: PHP implements a simple and practical verification code class, $image->config('width','height','characters Number', 'Verification code session index'), $image->create();//This will output a picture to the browser, generate a verification code, generate a verification code picture, set the interference pixel of the picture, and verify Draw verification codes one by one on the code pictures.

7.click captcha click verification code class implemented by php: Mainly introduces examples of click captcha click verification code class implemented by php. Different from the traditional verification code in the past, this verification code class It allows mobile phone users to click on a certain location to confirm the verification code, which is very practical.

8.Encapsulated verification code class implemented by PHP: A detailed analysis and introduction to the encapsulated verification code class implemented by PHP is performed. Use PHP to write a verification code class and encapsulate it. Output an image to the browser by accessing this method, and obtain a randomly created verification code string by calling this method.

9.php verification code class ValidateCode: I saw the ValidateCode written in PHP on the Internet to generate a verification code class. It feels good, so I will use it to analyze and learn.

10.php dynamically randomly generated verification code class: Generate a dynamic verification code class, use pure white to fill the rectangular box, you can also use interference codes, random colors, random placement, random characters String image output.

【Related verification code courses】

1.《php development verification code latest video tutorial》

2.《PHP development verification Code Tutorial Practical Practice》

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