Zend_File_Transfer is designed to support a variety of adapters and transfer directions. With Zend_File_Transfer you can upload, download and even forward (upload one adapter and download with another adapter at the same time) files.

Zend_File_Transfer and its adapters support different options. You can set all options either by passing them to the constructor or by calling setOptions($options). getOptions() will return the options that are currently set. The following is a list of all supported options.

Zend_File_Transfer has several methods that check for various states of the specified file. These are useful if you must process files after they have been uploaded. These methods include:

$upload = new Zend_File_Transfer();

// Returns all known internal file information
$files = $upload->getFileInfo();

foreach ($files as $file => $info) {
    // file uploaded ?
    if (!$upload->isUploaded($file)) {
        print "Why havn't you uploaded the file ?";
        continue;
    }

    // validators are ok ?
    if (!$upload->isValid($file)) {
        print "Sorry but $file is not what we wanted";
        continue;
    }
}

$upload->receive();

Zend_File_Transfer can return additional information on files. The following methods are available:

getFileName() accepts the name of the element as first parameter. If no name is given, all known filenames will be returned in an array. If the file is a multifile, you will also get an array. If there is only a single file a string will be returned.

By default file names will be returned with the complete path. If you only need the file name without path, you can set the second parameter, $path, which will truncate the file path when set to FALSE.

$upload = new Zend_File_Transfer();
$upload->receive();

// Returns the file names from all files
$names = $upload->getFileName();

// Returns the file names from the 'foo' form element
$names = $upload->getFileName('foo');

getFileSize() returns per default the real filesize in SI notation which means you will get 2kB instead of 2048. If you need only the plain size set the useByteString option to FALSE.

$upload = new Zend_File_Transfer();
$upload->receive();

// Returns the sizes from all files as array if more than one file was uploaded
$size = $upload->getFileSize();

// Switches of the SI notation to return plain numbers
$upload->setOptions(array('useByteString' => false));
$size = $upload->getFileSize();

getHash() accepts the name of a hash algorithm as first parameter. For a list of known algorithms refer to PHP's hash_algos method. If you don't specify an algorithm, the crc32 algorithm will be used by default.

$upload = new Zend_File_Transfer();
$upload->receive();

// Returns the hashes from all files as array if more than one file was uploaded
$hash = $upload->getHash('md5');

// Returns the hash for the 'foo' form element
$names = $upload->getHash('crc32', 'foo');

getMimeType() returns the mimetype of a file. If more than one file was uploaded it returns an array, otherwise a string.

$upload = new Zend_File_Transfer();
$upload->receive();

$mime = $upload->getMimeType();

// Returns the mimetype for the 'foo' form element
$names = $upload->getMimeType('foo');

Zend_File_Transfer can give you the actual state of a fileupload in progress. To use this feature you need either the APC extension which is provided with most default PHP installations, or the UploadProgress extension. Both extensions are detected and used automatically. To be able to get the progress you need to meet some prerequisites.

First, you need to have either APC or UploadProgress to be enabled. Note that you can disable this feature of APC within your php.ini.

Second, you need to have the proper hidden fields added in the form which sends the files. When you use Zend_Form_Element_File this hidden fields are automatically added by Zend_Form.

When the above two points are provided then you are able to get the actual progress of the file upload by using the getProgress() method. Actually there are 2 official ways to handle this.

$adapter = new Zend_ProgressBar_Adapter_Console();
$upload  = Zend_File_Transfer_Adapter_Http::getProgress($adapter);

$upload = null;
while (!$upload['done']) {
    $upload = Zend_File_Transfer_Adapter_Http:getProgress($upload);
}

$upload  = Zend_File_Transfer_Adapter_Http::getProgress();

while (!$upload['done']) {
    $upload = Zend_File_Transfer_Adapter_Http:getProgress($upload);
    print "\nActual progress:".$upload['message'];
    // do whatever you need
}