How to dynamically call functions in php

How to dynamically call a function in php: first define a function; then assign the function name or string to a variable; finally use the variable name instead of the function name to dynamically call the function.

How to dynamically call functions in php:

1. Define a function

2. Assign the function name (string) to a variable

3. Use the variable name instead of the function name to dynamically call the function

The detailed code is as follows:

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