How to generate graphic CAPTCHA by GD Library in PHP5

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.

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