Modification of variable processing mechanism
# array_pop needs to be passed by reference, and php5 cannot do it either. This shouldn’t be considered a new feature
##The brackets should still be usable
global does not support reference declaration of instance variables in php5. In the final analysis, it is only from the left To the right explanation question
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Generally I don’t use global very much, just skip it and don’t worry about it
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