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This article mainly introduces the PHP5 GD library how to generate graphics CAPTCHA, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Similar to the following

1. Use the GD library function to generate the picture and write the specified characters on the picture

Imagecreatetruecolor create a new true color image

Imagecolorallocate assigns colors to an image (color palette)

Imagestring drawing character

Imageline draws lines

Imagesetpixel hit the pixel.

two。 Output picture

Imagejpeg ($img)

PHP implementation process, detailed comments in the code, not too much explanation here

Verify.php

The code is as follows:

Submit.php

The code is as follows:

MRYH.ttf in the code is the font you want to set.

Thank you for reading this article carefully. I hope the article "how to generate graphic verification code in GD library in PHP5" shared by the editor will be helpful to everyone. At the same time, I also hope that you will support and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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