Description:
------------
    <?php
     
    echo $a = urlencode(base64_encode('fazlul')).' ';
    echo $str = @iconv('UTF-8', 'UTF-8//IGNORE', $a).' ';
    echo $c = urldecode(base64_decode($str));
     
    echo "\r\n\r\n";
     
    echo $a = urlencode(base64_encode('masud')).' ';//same for karim
    echo $str = @iconv('UTF-8', 'UTF-8//IGNORE', $a).' ';
    echo $c = urldecode(base64_decode($str));

Test script:
---------------
Same process but the output is different.

Expected result:
----------------


input: fazlul
output: fazlul

But,

input: masud 
output: masud

Actual result:
--------------
input: fazlul
output: fazlul

But,

input: masud 
output: masud7