Hi,
Today we are going to learn about force downloading prompt in PHP.
While i am doing my projects, i had a requirement for file download, File type will be changed, So i made a research on this and made simple useful script which can be use any where to prompt download by giving path and file name . Let us create a function download_file and pass full file path and filename , we can use third argument to mention the MIME Type of file
download_file($sourceFile, $fileName, $mime_type = '')
Next we can check whether we have permission to read the file.if not it will return 404 error
if (!is_readable($sourceFile)) {
header("HTTP/1.1 404 Not Found");
return;
}
Now we are going to create an array of list of mime types. so we can compare with this array and set correct header content type
$mime_types_list = array(
"gif" => "image/gif",
"png" => "image/png",
"jpeg" => "image/jpg",
"jpg" => "image/jpg",
"pdf" => "application/pdf",
"csv" => "application/csv",
"txt" => "text/plain",
"html" => "text/html",
"htm" => "text/html",
"exe" => "application/octet-stream",
"zip" => "application/zip",
"doc" => "application/msword",
"xls" => "application/vnd.ms-excel",
"ppt" => "application/vnd.ms-powerpoint",
"php" => "text/plain"
);
Next we are going to set mime type if we already pass the MIME type into function it will take that MIME ,else we are going to use a function pathinfo to retrieve the extension of file and we will compare with already created array to get content type
$path_parts = pathinfo($sourceFile); //pathinfo
if ($mime_type == '') {
$file_extension = $path_parts['extension'];
if (array_key_exists($file_extension, $mime_types_list)) {
$mime_type = $mime_types_list[$file_extension];
} else {
$mime_type = "application/force-download";
};
};
After that we will clean and start the output buffer
@ob_end_clean();
Then we can set the content type and headers
if (ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
header('Content-Type: ' . $mime_type);
header('Content-Disposition: attachment; filename="' . $fileName . '"');
header("Content-Transfer-Encoding: binary");
header('Accept-Ranges: bytes');
header("Cache-control: private");
header('Pragma: private');
lastly we are going to read each line by line and print that as shown below.
$chunksize = 1 * (1024 * 1024);
$bytes_send = 0;
if ($sourceFile = fopen($sourceFile, 'r')) {
while (!feof($sourceFile) &&
(!connection_aborted())
) {
$buffer = fread($sourceFile, $chunksize);
print($buffer); // is also possible
flush();
}
fclose($sourceFile);
} else {
header("HTTP/1.1 505 Internal server error");
return;
}
That is it !!!!! Now we can have a look, How we can read the file using created function We can make a path file and the name we want to give while downloading and pass to function . It will download prompt for file. example for reading file and download prompt
$filepath = 'sample.pdf';
$filename = 'sample.pdf';
download_file($filepath, $filename);
exit;
?>
Full code
<?php
/**
* function to download a file from server
*
* list all the values in grid
*
* @auther Shabeeb <me@blog.shabeebk.com >
* @createdon : 06-08-2014
* @
*
* @param source $sourceFile : file pathe
* @param source $fileName : file name for download
* @param source $mime_type : MIME type optional field
* @return type
* exceptions
*
*
*/
function download_file($sourceFile, $fileName, $mime_type = '') {
if (!is_readable($sourceFile)) {
header("HTTP/1.1 404 Not Found");
return;
}
$size = filesize($sourceFile);
$fileName = rawurldecode($fileName);
$mime_types_list = array(
"gif" => "image/gif",
"png" => "image/png",
"jpeg" => "image/jpg",
"jpg" => "image/jpg",
"pdf" => "application/pdf",
"csv" => "application/csv",
"txt" => "text/plain",
"html" => "text/html",
"htm" => "text/html",
"exe" => "application/octet-stream",
"zip" => "application/zip",
"doc" => "application/msword",
"xls" => "application/vnd.ms-excel",
"ppt" => "application/vnd.ms-powerpoint",
"php" => "text/plain"
);
$path_parts = pathinfo($sourceFile); //pathinfo
if ($mime_type == '') {
$file_extension = $path_parts['extension'];
if (array_key_exists($file_extension, $mime_types_list)) {
$mime_type = $mime_types_list[$file_extension];
} else {
$mime_type = "application/force-download";
};
};
@ob_end_clean();
// if IE, otherwise Content-Disposition ignored
if (ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
header('Content-Type: ' . $mime_type);
header('Content-Disposition: attachment; filename="' . $fileName . '"');
header("Content-Transfer-Encoding: binary");
header('Accept-Ranges: bytes');
header("Cache-control: private");
header('Pragma: private');
$chunksize = 1 * (1024 * 1024);
$bytes_send = 0;
if ($sourceFile = fopen($sourceFile, 'r')) {
while (!feof($sourceFile) &&
(!connection_aborted())
) {
$buffer = fread($sourceFile, $chunksize);
print($buffer); // is also possible
flush();
}
fclose($sourceFile);
} else {
header("HTTP/1.1 505 Internal server error");
return;
}
die();
}
$filepath = 'sample.pdf';
$filename = 'sample.pdf';
download_file($filepath, $filename);
exit;
?>
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