How to call a function in php when its name is a variable

 function fun()
 {
 echo 'fun';
 }
 $a = 'fun';
 $a();
?>

The $a variable above is the fun() function. Calling $a() is the same as calling fun().

Another way. Call a function in PHP: mixed call_user_func ( callback $function [, mixed $parameter [, mixed $...]] ) mixed call_user_func_array ( callback $function, array $param_arr )

Example:

//Function name as variable
//by bbs.it-home.org
function barber($type)
{
 echo "You wanted a $type haircut, no problem" ;
}
call_user_func('barber', "mushroom");
call_user_func('barber', "shave");
?>