Detailed explanation of php variable function examples

Use of variable functions (principle of equal substitution): In PHP, if the "function name" is assigned to a string type variable, but when using the variable, if it has parentheses, the PHP engine will Analytical function, I hope it can help everyone.

Note: Variable functions cannot be used for echo, print, unset(), isset(), empty(), include, require and similar language structures. They need to be encapsulated and implemented by yourself

Example:

$funcName='md5'; echo $funcName('king');//md5() echo '
';

get_defined_functions() Gets all defined functions and returns an array, including system functions and user-defined functions

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