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$overwrite = 0;//ÊÇ·ñÔÊÐí¸²¸ÇÏàͬÎļþ,1:ÔÊÐí,0:²»ÔÊÐí 
$f_input="Files";//ÉèÖÃÉÏ´«ÓòÃû³Æ
  foreach($_FILES[$f_input]["error"] as $key => $error){ 
  $up_error="no"; 
  if ($error == UPLOAD_ERR_OK){ 
  $f_name=$_FILES[$f_input]['name'][$key];//»ñÈ¡ÉÏ´«Ô´ÎļþÃû 

  $uploadfile=$uploaddir.strtolower(basename($f_name)); 
   
  $tmp_type=substr(strrchr($f_name,"."),1);//»ñÈ¡ÎļþÀ©Õ¹Ãû
$tmp_type=strtolower($tmp_type); 

  if (file_exists($uploadfile)&& !$overwrite){ 
  echo "<script>alert('¶Ô²»Æð,Îļþ ".$f_name." ÒѾ­´æÔÚ,ÉÏ´«Ê§°Ü!')</script>"; 
  $up_error="yes"; 
  } 
  $string = 'abcdefghijklmnopgrstuvwxyz0123456789';
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/// <summary>
  /// ¸½¼þ±£´æ·½·¨
  /// </summary>
  /// <param name="UpFile">ÉÏ´«ÎļþµÄ¿Ø¼þ</param>
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