Is there something wrong with this online editor?

Question

What was written on the left is correct, but what was edited and submitted on the right is wrong. It has been misleading me for a long time. I have a picture to tell the truth.

shuffle · Answer

The version of his online editor is php7. The way of defining global variables in the global way seems to have been abolished in php7. It is recommended to use $_GLOBAL directly, which is the officially recommended way

Php8, I'm coming too

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