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When I run my own code, I keep getting errors:
Notice: Undefined variable: meiyou in E:\work\study\PHP\phpstudy\www\127.0.0.2\phpstu_1.php on line 3
Then a NULL will be printed, but it is correct in the example. Why is this?
126的邮箱，设置错了，尴尬
This is not an error. . Just a reminder that this variable is not declared. . . You can enter a piece of code in front to cancel the reminder
Looking at your error report, there is no $ in front of the variable name
Notice: Undefined variable: meiyou
The variable is undefined
The path is wrong
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
This is not an error. . Just a reminder that this variable is not declared. . . You can enter a piece of code in front to cancel the reminder
Looking at your error report, there is no $ in front of the variable name
Notice: Undefined variable: meiyou
The variable is undefined
The path is wrong