php-image-resize
PHP class to resize and scale images.
Setup
This package is available through Packagist with the vendor and package identifier the same as this repo.
If using Composer, in your composer.json
file add:
{
"require": {
"eventviva/php-image-resize": "1.5.*"
}
}
Otherwise:
include '/path/to/ImageResize.php';
Because this class uses namespacing, when instantiating the object, you need to either use the fully qualified namespace:
$image = new \Eventviva\ImageResize();
Or alias it:
use \Eventviva\ImageResize;
$image = new ImageResize();
Usage
To scale an image, in this case to half it's size (scaling is percentage based):
$image = new ImageResize('image.jpg');
$image->scale(50);
$image->save('image2.jpg')
To resize an image according to one dimension (keeping aspect ratio):
$image = new ImageResize('image.jpg');
$image->resizeToHeight(500);
$image->save('image2.jpg');
$image = new ImageResize('image.jpg');
$image->resizeToWidth(300);
$image->save('image2.jpg');
To resize an image to best fit a given set of dimensions (keeping aspet ratio):
$image = new ImageResize('image.jpg');
$image->resizeToBestFit(500, 300);
$image->save('image2.jpg');
To to crop an image:
$image = new ImageResize('image.jpg');
$image->crop(200, 200);
$image->save('image2.jpg');
This will scale the image to as close as it can to the passed dimensions, and then crop and center the rest.
In the case of the example above, an image of 400px × 600px will be resized down to 200px × 300px, and then 50px will be taken off the top and bottom, leaving you with 200px × 200px.
If you are happy to handle aspect ratios yourself, you can resize directly:
$image = new ImageResize('image.jpg');
$image->resize(800, 600);
$image->save('image2.jpg');
This will cause your image to skew if you do not use the same width/height ratio as the source image.
Loading and saving images from string
To load an image from a string:
$image = ImageResize::createFromString(base64_decode('R0lGODlhAQABAIAAAAQCBP///yH5BAEAAAEALAAAAAABAAEAAAICRAEAOw=='));
$image->scale(50);
$image->save('image.jpg');
You can also return the result as a string:
$image = ImageResize::createFromString(base64_decode('R0lGODlhAQABAIAAAAQCBP///yH5BAEAAAEALAAAAAABAAEAAAICRAEAOw=='));
$image->scale(50);
echo $image->getImageAsString();
Magic __toString()
is also supported:
$image = ImageResize::createFromString(base64_decode('R0lGODlhAQABAIAAAAQCBP///yH5BAEAAAEALAAAAAABAAEAAAICRAEAOw=='));
$image->resize(10, 10);
echo (string)$image;
Displaying
As seen above, you can call $image->save('image.jpg');
To render the image directly into the browser, you can call $image->output()
;
Image Types
When saving to disk or outputting into the browser, the script assumes the same output type as input.
If you would like to save/output in a different image type, you need to pass a (supported) PHP IMAGETYPE_
* constant:
IMAGETYPE_GIF
IMAGETYPE_JPEG
IMAGETYPE_PNG
This allows you to save in a different type to the source:
$image = new ImageResize('image.jpg');
$image->resize(800, 600);
$image->save('image.png', IMAGETYPE_PNG);
Quality
The properties $quality_jpg
and $quality_png
are available for you to configure:
$image = new ImageResize('image.jpg');
$image->quality_jpg = 100;
$image->resize(800, 600);
$image->save('image2.jpg');
By default they are set to 75 and 0 respectively. See the manual entries for imagejpeg()
and imagepng()
for more info.
You can also pass the quality directly to the save()
, output()
and getImageAsString()
methods:
$image = new ImageResize('image.jpg');
$image->crop(200, 200);
$image->save('image2.jpg', null, 100);
$image = new ImageResize('image.jpg');
$image->resizeToWidth(300);
$image->output(IMAGETYPE_PNG, 4);
$image = new ImageResize('image.jpg');
$image->scale(50);
$result = $image->getImageAsString(IMAGETYPE_PNG, 4);
We're passing null
for the image type in the example above to skip over it and provide the quality. In this case, the image type is assumed to be the same as the input.
Interlacing
By default, image interlacing is turned off. It can be enabled by setting $interlace
to 1
:
$image = new ImageResize('image.jpg');
$image->scale(50);
$image->interlace = 1;
$image->save('image2.jpg')
Chaining
When performing operations, the original image is retained, so that you can chain operations without excessive destruction.
This is useful for creating multiple sizes:
$image = new ImageResize('image.jpg');
$image
->scale(50)
->save('image2.jpg')
->resizeToWidth(300)
->save('image3.jpg')
->crop(100, 100)
->save('image4.jpg')
;