How to set a picture as a circle by php

This article mainly explains "php how to set the picture to a circular picture". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "php how to set the picture to a circular picture".

Php set the picture as a round picture method: 1, create a PHP sample file; 2, create a transparent picture; 2, through the "function yuan_img ($imgpath) {...}" method to process the picture into a circle.

This article operating environment: windows7 system, PHP7.1 version, DELL G3 computer

How does php set the picture to a circular picture?

Circular processing of php pictures:

The php gd library functions used are

Imagecoloratimagesetpixel

The first is to process the picture into a circle:

The original picture is as follows:

After processing, the effect:

Calculate using the following formula

(xmura) * (xmura) + (ymurb) * (ymerb)