DAT is what file format PHP mandatory file download function code arbitrary file format

Copy the Code code as follows:

/********************
* @file-path to File
*/
function Force_download ($file)
{
if ((Isset ($file)) && (File_exists ($file))) {
Header ("Content-length:". FileSize ($file));
Header (' Content-type:application/octet-stream ');
Header (' content-disposition:attachment; Filename= '. $file. '"');
ReadFile ("$file");
} else {
echo "No file selected";
}
}

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