php dynamic function call

1//Simple
2$vFn = "Login";
3$vFn();
4
5//OR
6call_user_func($vFn, $vars); //Returns the return value of the callback.
7
8//Best
9abstract class mBase {
10	public function main() {
11    	.....
12  	}
13}
14
15class mA extends mBase {
16	public function main() {
17    	parent->main();
18    	.....
19  	}
20}
21
22class mB extends mBase {
23  	public function main() {
24    	parent->main();
25    	.....
26  	}
27}
28function runMM(mBase $module) {
29  $module->main();
30}
31$m = 'mB'; //example
32runMM ($m);