The same code outputs 11 when tested locally, but the output of the web page editor is 6
2
0
0
This article written by our teacher can solve your problem: What are the changes in the global variable mechanism under PHP5 and PHP7 versions?
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
