Starting november 2016, this repository has been abandoned.
See instead: cakephp-thumber.

Thumbs is a CakePHP plugin to create thumbnails.
It can create thumbnails (rectangular or square) of local and remote images.

You can install the plugin via composer:

$ composer require --prefer-dist mirko-pagliai/thumbs

You have to edit APP/config/bootstrap.php to load the plugin:

Plugin::load('Thumbs', ['bootstrap' => TRUE, 'routes' => TRUE]);

By default the plugin uses the APP/tmp/thumbs directory to create thumbnails.
So you have to create the directory and make it writable:

$ mkdir backup && chmod 775 tmp/thumbs/

You can change this directory by defining the THUMBS constant until the plugin is loaded.
Example:

define('THUMBS', 'alternative'.DS.'directory'.DS.'for'.DS.'thumbnails);
Plugin::load('Thumbs', ['bootstrap' => TRUE, 'routes' => TRUE]);

Simply use the ThumbHelper, after you have loaded it.

Basically the helper provides two methods, resize() (for rectangular thumbnails) and square() (for square thumbnails).

The resize() method takes height and/or width options. Example:

echo $this->Thumb->resize('logo.png', ['width' => 100]);

This will create and display a thumbnail of the APP/webroot/img/logo.png file, with a maximum width of 100 pixels.
Note that if the file path is a local file and if it's relative, it will be relative to APP/webroot/img.

You can also use full path. Example:

echo $this->Thumb->resize('/my/full/path/image.jpg', ['height' => 200, 'width' => 100]);

This will create and display a thumbnail of the /my/full/path/image.jpg file, with a maximum height of 200 pixel and a maximum width of 100 pixels.

You can also use remote file. Example:

echo $this->Thumb->resize('www.mysite.com/example.gif', ['width' => 100]);

This will create and display a thumbnail of the www.mysite.com/example.gif file, with a maximum width of 100 pixels.

Instead, the square() method creates a square thumbnail and takes the side option, indicating the length of the side. Example:

echo $this->Thumb->square('logo.png', ['side' => 100]);

This will create and display a square thumbnail of the APP/webroot/img/logo.png file, with sides of 100 pixels.
Note that for square thumbnails, the thumbnail will start from the center of the image.

Both methods also accept the force option (boolean values), which forces the thumbnail sizes larger than the origin image. Example:

echo $this->Thumb->resize('logo.png', ['force' => true, 'width' => 500]);

This will create and display a thumbnail of the APP/webroot/img/logo.png file, with a width of 500 pixels, even if the original image is smaller.

The helper also provides resizeUrl() and squareUrl() methods, that simply return the thumbnails url.

The image() and url() methods are magic methods that, based on the options given, call the other methods. Example:

echo $this->Thumb->image('logo.png', ['width' => 100]);

will call the resize() method, because there's the width option.

For transparency and insight into our release cycle and to maintain backward compatibility, Thumbs will be maintained under the Semantic Versioning guidelines.