Unique filenames when uploading using Zend_Filter_File_Rename (Zend Framework)
19 July 2012
I came across a scenario today where I needed to ensure that files uploaded always had a unique name and wouldn’t over-write a file which has the same name. ZF provides this facility but it’s not particularly well documented and I had some troubles using a couple of examples I found across the web. Alas, here is the solution.
Create a new form element
Whether you do this in a new instance of Zend_Form or one you instantiate in your controller is up to you. My example adds it to an instance of Zend_Form:
$element = new Zend_Form_Element_File('screenshot');
$element->setLabel(null)->setDestination(APPLICATION_PATH . '/path/to/uploads');
$element->addValidator('Count', false, 5);
$element->addValidator('Extension', false, 'jpg,png,gif');
$element->setRequired(true);
$this->addElement($element, 'foo');
Handle the upload before the file is saved in your controller:
By getting access to Zend_File_Transfer_Adapter_Http we can intercept the file before it is moved to the already-defined destination path. At this point we apply a filter to the upload which will rename the file.
$post = $request->getPost(); // This contains the POST params
if ($request->isPost()) {
if ($form->isValid($post)) {
$upload = new Zend_File_Transfer_Adapter_Http();
$filename = $upload->getFilename();
$filename = basename($filename);
$uniqueToken = md5(uniqid(mt_rand(), true));
$filterRename = new Zend_Filter_File_Rename(array('target' => '/path/to/uploads/' . $uniqueToken.$filename, 'overwrite' => false));
$upload->addFilter($filterRename);
if (!$upload->receive()) {
$this->view->message = 'Error receiving the file';
return;
}
$this->view->message = 'Screenshot(s) successfully uploaded';
}
}