Can't compare a decrypted variable to a string ?

[Graham Anderson <grahama@xxxxxxxx>]

For some reason,
I have to store a decrypted string as a variable before I can compare  
it to another string.

The decrypt function is located in another php script

//Get variable
$cmd = $_REQUEST['cmd'];

echo $cmd; //  uJy4p09z6bSR80eLNFnBWBj/EsRCfIz2C/WrcFNcZE8=
echo decrypt($cmd);    // makesmil

 $realcmd =  decrypt($cmd); // 'makesmil'

    if(            decrypt($cmd)==    'makesmil')        makesmil 
();  // FAILS
    elseif(    decrypt($cmd)==    $realcmd)            makesmil(); // 
SUCCEEDS

I'm sure it is something stupid

what am I doing wrong ?
g

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