Uploading Files

Quickly and easily upload, rename and resize files and images

Formr’s method of uploading and resizing files is fairly simplistic: Formr will provide basic security in renaming uploaded file names - by stripping out anything that’s not a letter, number or underscore - and allows for the checking of mime types and/or file extensions. It may satisfy most people’s uploading needs. However, if your file operations are more complex I suggest you disable file uploading ($form->process_uploads = false) and use the excellent class.upload.php by Colin Verot, available at http://verot.net.

Disabling upload processing will still let you use Formr to build your input fields, it just won't upload and process the files.


In order to upload files you will need to use the form_open_multipart() method to add multipart/form-data to your <form> tag. If you’re building a form in fastform() you’ll need to use the fastform_multipart() method.


This method is identical in all respects to the input_text() method except it sets the input type to file, allowing it to be used to upload files.

// a single file upload element
// multiple input elements using an array
$form->input_upload('file[]','Photo 1');
$form->input_upload('file[]','Photo 2');


Alias of input_file()


Identical to input_upload() except that it adds the multiple attribute to the input element, which allows the user to select multiple files with only one input. May not work in all browsers.


Example: Multiple File Inputs in the Same Form

Since we're uploading multiple files at the same time we have to add square brackets [] to the end of our field name to let PHP know we're uploading an array.


Lets you specify the types of files you will allow for upload to your server. Enter each file extension separated by a comma.

$form->upload_accepted_types = 'jpg,jpeg,gif,png';

You can also just enter the string images and Formr will automatically allow JPG, GIF, and PNG files.

$form->upload_accepted_types = 'images';


Same as $upload_accepted_types but more secure. Instead of checking file’s extension it checks the file’s mime type.

$form->upload_accepted_mimes = 'image/jpg,image/jpeg,image/gif,image/png';

You can also just enter the string images and Formr will automatically allow JPG, GIF, and PNG files.

$form->upload_accepted_mimes = 'images';


Maximum allowed size of the uploaded file, measured in bytes. Default is 2MB.

$form->upload_max_filesize = 3145728; // 3145728 bytes = 3MB


Lets you rename the file after it’s been uploaded.

// rename the file with a 32 character random hash.
$form->upload_rename = 'hash';

// will produce something like
// rename the file with a hash of your own length.
$form->upload_rename = 'hash[12]';

// will produce something like
// rename the file with a unix timestamp.
$form->upload_rename = 'timestamp';

// will produce something like
// prepend a string onto the original filename.
$form->upload_rename = 'prepend[my-file-]';

// will produce something like


Specifies the path to your upload directory.

$form->upload_dir = '/htdocs/uploads/';


Allows you to resize your uploaded images.

There are five (5) parameters to the $upload_resize property. Note: resizing is fairly basic; if you require more advanced resizing try class.upload.php by Colin Verot.

  1. Parameter one contains the max width of the resized image and is required.
  2. Parameter two contains the max height of the resized image and is required.
  3. Parameter three optionally adds a string to the beginning of the file name.
  4. Parameter four optionally specifies the upload directory. Leave this blank and Formr will use the same directory specified in $upload_dir
  5. Parameter five optionally contains the quality of the resized image. Default is 80%. JPG only.

The $upload_resize property takes an array as its value. The array key is the name of the process and can be anything you like, such as: “thumbnail”, “avatar”, “large_image”, etc. The array values are a simple string, and tell Formr what to do with the image. Each array key/value pair will perform a resize process on the uploaded image, so if you want to resize it 10 times, just add 10 key/value pairs.

// resize the original file to a max width and height of 150px and place it in `$upload_dir`
$form->upload_resize = array('resize' => '150,150');
// create a thumbnail image with `'tn_'` prepended to the file name, upload it into `/htdocs/uploads/tn/` and give it a max width and max height of 100px.
$form->upload_resize = array('thumbnail' => '100,100,tn_,/htdocs/uploads/tn/');

Resize the image 3 times, for a total of 4 images; the original upload and three resized images.

  • The first key will create an image with a max width and height of 600 pixels, will be put into the “large” directory and have a JPG quality of 80% (80% is the default if no quality is specified).
  • The second key will create an image with a max width and height of 100 pixels, will have the filename prepended with “tn_”, be put into the “thumbnail” directory and have a JPG quality of 90%.
  • The third key will create an image with a max width and height of 64 pixels, be put it into the “avatars” directory and have a JPG quality of 80%.
$resize = array(
	'large'		=> '600,600,,/www/formr/uploads/large/',
	'thumbnail'	=> '100,100,tn_,/www/formr/uploads/thumbnails/,90',
	'avatar'	=> '64,64,,/www/formr/uploads/avatars/'
$form->upload_resize = $resize;

A Complete Example

// instantiate Formr
$form = new Formr();

// set our upload directory
$form->upload_dir = 'uploads';

// rename our upload with a 32-character hash
$form->upload_rename = 'hash';

// only allow images to be uploaded
$form->upload_accepted_mimes = 'images';

// resize the upload
$form->upload_resize = array(
	'thumbnail'	=> '100,100,tn_,/www/formr/uploads/thumbnails/,90'

// check if the form has been submitted
if($form->submit()) {
	// process the upload and put it into an array
	$file = $form->post('file');

    // printr() the array to see its keys/values

// always print Formr's messages!
echo $form->messages();

// open our form element
echo $form->form_open_multipart();

// add our file element
echo $form->input_upload('file');

// submit button
echo $form->input_submit();

//close the form
echo $form->form_close();


If you want to use Formr to build your form fields, but do not want it to upload and process files, just set this to FALSE and drop your favorite upload class/functions into your PHP script.

$form->upload_process = false