How to set image as background in php

We can output the style code in php to change the html background image.

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However, it is not recommended to output the style file in the PHP code. It should be written in the HTML document, or the CSS style file should be written separately and introduced in the HTML.

1. Write css in html

2. Import css files

//main.css文件
body{background:url(背景图片地址);}

//在html文件head标签中引入

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