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$upload_dir=="./site_data/";
$upload_bak="./site_data/";
$file=$_FILES['upload'];
$ext = explode(".",$file['name']);
$ext = $ext[count($ext)-1];
$filename1 = substr($file['name'],0,(strlen($file['name'])-strlen($ext)-1));
$bakfilename = "{$username}_{$uid}_".date("Y_m_d_H_i_s").".{$ext}";
if(move_uploaded_file($file['tmp_name'],$upload_bak.$file['name'])){
copy($upload_bak.$file['name'], $upload_bak.$bakfilename);
}
$upload_dir="./site_data/";
$upload_bak="./bak_data/";
$file=$_FILES['upload'];
move_uploaded_file($file['tmp_name'],$upload_dir.$file['name']);
$ext = explode(".",$file['name']);
$ext = $ext[count($ext)-1];
$bakfilename = "{$username}_{$uid}_".data("Y_m_d_H_i_s").".{$ext}";
copy($upload_dir.$file['name'], $upload_bak.$bakfilename );
$ext = $ext[count($ext)-1]; //将$ext最后一个值赋值给$ext;
$bakfilename = "{$username}_{$uid}_".data("Y_m_d_H_i_s").".{$ext}"; //拼接文件名
copy($upload_dir.$file['name'], $upload_bak.$bakfilename );// 将上传的文件复制为备份文件。
$ext = $ext[count($ext)-1];
$bakfilename = "{$username}_{$uid}_".data("Y_m_d_H_i_s").".{$ext}";
copy($upload_dir.$file['name'], $upload_bak.$bakfilename )