Php method for generating image verification code _ php skills

Verification code is a security protection mechanism. manual verification is required during registration. the implementation of the image verification code is very simple, interested friends can refer to this article to share with you how to generate an image verification code in php for your reference. The details are as follows:

First, a fixed number of characters are randomly extracted from the specified character set, and painted on the canvas in an irregular way. then, some interference points and interference elements are added as appropriate, and the image is output, A brand new verification code is complete.

The front-end code is as follows:

 
  This is a test!