php - Compare a function with another function -

i made function contain include file, can compare function other function ?

e.g.

in a.php

<?php $a = "this file"; ?> 

in b.php

<?php $b = "this file"; ?> 

in function.php

<?php function a(){ include("a.php"); }  function b(){ include ("b.php"); }  /* question can compare between function a() , function b() ? */  if(a()==b()){ echo "it's same words"; } else {echo "not same words";}  ?> 

i know there's simple way case, it's example, , want use way complicated algorithm.

regards.

nur haryadi

think way: when 2 functions equal? when results same parameters returns same values. means functions needs return something.

function a() {     ob_start();     include("a.php");      return ob_get_clean(); }   function b() {     ob_start();     include("b.php");      return ob_get_clean(); }  if (strcmp(a(), b()) == 0) {     echo "it's same words"; }