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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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