Static variable assignment problems

Static variable assignment problems? $ A100; static & nbsp; $ B $ a; echo & nbsp; $ B; why cannot I assign values to static variables like this? Shared to: static variable assignment problem?
$ A = 100;
Static $ B = $;
Echo $ B;

Why can't I assign values to static variables like this?

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------ Solution --------------------
Static variables are created during php pre-compilation.
Therefore, normal variables cannot be assigned values because they are created during subsequent running periods.

To put it bluntly, you cannot assign a non-existent value to a static variable.