php - Checksum Failure -

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i've got script , produces following error: 001 checksum failure

this script, don't know what's wrong it, me?

<?php   /*      access control targetpay pay per use     (c) targetmedia 2007     upload file in protected directory , make sure     .htaccess support enabled.     modifications in code allowed not supported     product-id: 28717    generated: 16-01-2011 14:57:05   */   define ("checksum", "739b54dc26");  define ("err001", "001 checksum failure");  define ("err002", "002 can't open .htaccess writing. check rights.");  define ("err003", "003 i/o error, cannot write .htaccess. disk full?");  list($thispage) = explode("?",      "http://".$_server["http_host"].$_server["request_uri"]);   $payscreen = "http://www.targetpay.nl/send/?id=28717&rtlo=51090".      "&pm=".urlencode("inline=1").      "&ref=".urlencode($thispage);   header ("content-type: text/plain");   if ($_get["checksum"] != checksum) {      die (err001);      }   function ip2hex ($ip) {      list ($a,$b,$c,$d) = explode(".", $ip);      return    str_pad(dechex($a),2,"0",str_pad_left).              str_pad(dechex($b),2,"0",str_pad_left).              str_pad(dechex($c),2,"0",str_pad_left).              str_pad(dechex($d),2,"0",str_pad_left);      }   function hex2ip ($hex) {      return  hexdec(substr($hex,0,2)).".".              hexdec(substr($hex,2,2)).".".              hexdec(substr($hex,4,2)).".".              hexdec(substr($hex,6,2));      }   function parse ($whitelist, $payscreen) {      $here = substr($_server["script_filename"],          strrpos ($_server["script_filename"], "/") + 1);       $o =    "errordocument 403 $payscreen\n".              "<files .htaccess>\n".              "order allow,deny\n".              "deny all\n".              "</files>\n".              "<files $here>\n".              "order allow,deny\n".              "allow all\n".              "</files>\n".              "order deny,allow\n".              "deny all\n";       if ((!$whitelist) || ($whitelist=="empty")) {          return $o; }       $iplist = explode(",", $whitelist);      foreach ($iplist $hex) {          $ip = hex2ip ($hex);          if ($ip) {              $o .= "allow $ip\n";              }          }      return $o;      }   if ($_get["register"]) {      $fp = @fopen(".htaccess", "w+");      if (!$fp) {          die (err002);          }      if (!@fwrite ($fp, parse($_get["register"],$payscreen))) {          die (err003);          }      @fclose ($fp);      echo "000 ok";      }   if ($_get["reset"]) {      @unlink (".htaccess");      $fp = @fopen(".htaccess", "w+");      if (!$fp) {          die (err002);          }      if (!@fwrite ($fp, parse("",$payscreen))) {          die (err003);          }      @fclose ($fp);      echo "000 reset ok";      }   if ($_get["dump"]) {      echo @implode("",file(".htaccess"));      echo "\n-eof-";      }  ?>

many thanks!

i dont think error. actually

if($_get["checksum"] != checksum) {      die (err001); }

this condition getting true, output not error. check data wherever getting initially.its not programmatic error sure.


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