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小伙看你根骨奇佳，潜力无限，来学PHP伐。
Please try to use the following method to find which variable has the problem
In Xcode, use the shortcut key +7 to enter the breakpoint interface.
Click the "+" in the lower left corner and add a global exception breakpoint,
Run the program.
If the problem cannot be solved through the above solutions, please post the relevant code and exception screenshots.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Please try to use the following method to find which variable has the problem
In Xcode, use the shortcut key +7 to enter the breakpoint interface.
Click the "+" in the lower left corner and add a global exception breakpoint,
Run the program.
If the problem cannot be solved through the above solutions, please post the relevant code and exception screenshots.