Question

please see the code below :

<?php
$str1 = 'My Name Is : ';
$str2 = 'Dvid!';
echo $str1.$str2;
?>

just a simple php code.
i want to encode (for example base64) this php file and use encoded php file instead of normal.
so the base64 encode of the codes upper is like below :

PD9waHANCiRzdHIxID0gJ015IE5hbWUgSXMgOiAnOw0KJHN0cjIgPSAnRHZpZCEnOw0KZWNobyAkc3RyMS4kc3RyMjsNCj8+DQo=

now how can i use that encoded php file?
i think eval() function is the answer!
so i changed the php file like this for use :

<?php
$str = 'PD9waHANCiRzdHIxID0gJ015IE5hbWUgSXMgOiAnOw0KJHN0cjIgPSAnRHZpZCEnOw0KZWNobyAkc3RyMS4kc3RyMjsNCj8+DQo=';
eval("base64_decode(\$str);");
?>

my problem is i really do n’t know why the output is blank (white screen)?
how can i fix this problem?

EDIT 1 :
i test using include instead after answers like below and i got an error :

<?php
include 'data://text/plain;base64,PD9waHANCiRzdHIxID0gJ015IE5hbWUgSXMgOiAnOw0KJHN0cjIgPSAnRHZpZCEnOw0KZWNobyAkc3RyMS4kc3RyMjsNCj8';
?>

and error :

important note :
i am looking for a way without any changing on server configurations, because we do n’t have access on remote host after publish…

EDIT 2 :
i removed

<?php
?>

part from base64 encode -> still have blank screen.

thanks for attention

Answer 1

Two problems here:

1. You’re evaluating the code:

   base64_decode($str);
   

   which does nothing.

2. There are still <?php and ?> tags in there, which eval can’t handle.

So, one interesting solution is to use include instead, with a PHP data:// URI:

include 'data://text/plain;base64,PD9waHANCiRzdHIxID0gJ015IE5hbWUgSXMgOiAnOw0KJHN0cjIgPSAnRHZpZCEnOw0KZWNobyAkc3RyMS4kc3RyMjsNCj8+DQo=';

Note that you’ll need allow_url_include enabled for this to work.