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Intervention Request

A customizable Intervention Image wrapper to use image simple re-sampling features over urls and a configurable cache.

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Ready-to-go Docker image

Intervention Request is now available as a standalone Docker server to use with whatever CMS or language you need:

docker pull ambroisemaupate/intervention-request;
# Make sure to share your volume with READ-ONLY flag
docker run -v "/my/images/folder:/var/www/html/web/images:ro" -p 8080:80/tcp ambroisemaupate/intervention-request;

Garbage collector runs every hour as a crontab job and will purge cache files created more than $IR_GC_TTL seconds ago.

Docker Compose example

version: '3'
        image: ambroisemaupate/intervention-request:latest
            # You can store cache in a volume too
            #- cache:/var/www/html/web/assets
            - ./my/images/folder:/var/www/html/web/images:ro
        # You can override some defaults below
            IR_GC_PROBABILITY: 400
            IR_GC_TTL: 604800
            IR_RESPONSE_TTL: 31557600
            IR_USE_FILECHECKSUM: 0
            IR_DRIVER: gd
            IR_CACHE_PATH: /var/www/html/web/assets
            IR_IMAGES_PATH: /var/www/html/web/images
            IR_IGNORE_PATH: /assets
            IR_DEFAULT_QUALITY: 80
            - 8080:80/tcp
        # Uncomment lines below for Traefik usage
        #    - "traefik.enable=true"
        #    - ""
        #    - ""
        #    - ""
        #    # Listen HTTP
        #    - "traefik.http.routers.intervention.entrypoints=http"
        #    - "traefik.http.routers.intervention.rule=Host(`intervention.test`)"
        #    - "traefik.http.routers.intervention.service=intervention"
        #    - default
        #    - frontproxynet

You don’t need to read further if you do not plan to embed this library in your PHP application.


composer require ambroisemaupate/intervention-request

Intervention Request is based on symfony/http-foundation component for handling HTTP request, response and basic file operations. It wraps Intervention/image feature with a simple file cache managing.


Intervention request use a dedicated class to configure your image request parameters. Before creating InterventionRequest object, you must instantiate a new AM\InterventionRequest\Configuration object and set cache and images paths.


This code will create a configuration with cache and images folders in the same folder as your PHP script (APP_ROOT). Notice that in the default index.php file, images path is defined to /test folder in order to use the testing images. You should always set this path against your website images folder to prevent processing other files.

You can edit each configuration parameters using their corresponding setters:

  • setCaching(true|false): use or not request cache to store generated images on filesystem (default: true);
  • setCachePath(string): image cache folder path;
  • setUsePassThroughCache(true|false): use or not pass-through cache to by-pass PHP processing once image is generated;
  • setDefaultQuality(int): default 90, set the quality amount when user does not specify it;
  • setImagesPath(string): requested images root path;
  • setTtl(integer): cache images time to live for internal garbage collector (default: 1 week);
  • setResponseTtl(integer): image HTTP responses time to live for browser and proxy caches (default: 1 year);
  • setDriver('gd'|'imagick'): choose an available Image Intervention driver;
  • setTimezone(string): PHP timezone to build \DateTime object used for caching. Set it here if you have not set it in your php.ini file;
  • setGcProbability(integer): Garbage collector probability divisor. Garbage collection launch probability is 1/$gcProbability where a probability of 1/1 will launch GC at every request.
  • setUseFileChecksum(true|false): Use file checksum to test if file is different even if its name does not change. This option can be greedy on large files. (default: false).
  • setJpegoptimPath(string): Optional — Tells where jpegoptim binary is for JPEG post-processing (not useful unless you need to stick to 100 quality).
  • setPngquantPath(string): Optional — Tells where pngquant binary is for PNG post-processing. This post-processing tool is highly recommended as PNG won’t be optimized without it.
  • setLossyPng(true|false): Optional — Tells pngquant/pingo binaries to use palette lossy compression (default: false).

Available operations

Query attribute Description Usage
image Native image path relative to your configuration imagePath ?image=path/to/image.jpg
fit Crop and resize combined It needs a width and a height in pixels, this filter can be combined with align to choose which part of your image to fit …&fit=300x300
align Crop and resize combined Choose which part of your image to fit. …&align=c
flip Mirror image horizontal or vertical You can set h for horizontal or v for vertical flip. …&flip=h
crop Crop an image It needs a width and a height in pixels …&crop=300x300
width Resize image proportionally to given width It needs a width in pixels …&width=300
height Resize image proportionally to given height It needs a height in pixels …&height=300
crop + height/width Do the same as fit using width or height as final size …&crop=300x300&width=200: This will output a 200 x 200px image
background Matte a png file with a background color …&background=ff0000
greyscale/grayscale Turn an image into a greyscale version …&greyscale=1
blur Blurs an image …&blur=20
quality Set the exporting quality (1 - 100), default to 90 …&quality=95
progressive Toggle progressive mode …&progressive=1
interlace Toggle interlaced mode …&interlace=1
sharpen Sharpen image (1 - 100) …&sharpen=10
contrast Change image contrast (-100 to 100, 0 means no changes) …&contrast=10
no_process Disable all image processing by PHP, this does not load image in memory but executes any post-process optimizers (such as pngquant, jpegoptim…) …&no_process=1

Fit position

Due to URL rewriting, align filter can only takes one or two letters as a value. When no align filter is specified, center is used:

URL value Alignment
tl top-left
t top
tr top-right
l left
c center
r right
bl bottom-left
b bottom
br bottom-right

Using standalone entry point

An index.php file enables you to use this tool as a standalone app. You can adjust your configuration to set your native images folder or enable/disable cache.

Setup it on your webserver root, in a intervention-request folder and call this url (for example using MAMP/LAMP on your computer with included test images): http://localhost:8888/intervention-request/?image=images/testPNG.png&fit=100x100

Using as a library inside your projects

InterventionRequest class works seamlessly with Symfony Request and Response. It’s very easy to integrate it in your Symfony controller scheme:

use AM\InterventionRequest\Configuration;
use AM\InterventionRequest\InterventionRequest;

 * A test configuration
$conf = new Configuration();
// Comment this line if jpegoptim is not available on your server
// Comment this line if pngquant is not available on your server

 * InterventionRequest constructor asks 2 objects:
 * - AM\InterventionRequest\Configuration
 * - Symfony\Component\HttpFoundation\Request
$intRequest = new InterventionRequest($conf);
// Handle request and process image

// getResponse returns a Symfony\Component\HttpFoundation\Response object
// with image mime-type and data. All you need is to send it!
return $intRequest->getResponse($request);

Use URL rewriting

If you want to use clean URL. You can add ShortUrlExpander class to listen to shorten URL like: http://localhost:8888/intervention-request/f100x100-g/images/testPNG.png.

First, add an .htaccess file (or its Nginx equivalent) to activate rewriting:

# .htaccess
# Pretty URLs
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [S=40]
RewriteRule . index.php [L]

Then add these lines to your application before handling InterventionRequest. ShortUrlExpander will work on your existing $request object.

use AM\InterventionRequest\ShortUrlExpander;
 * Handle short url with Url rewriting
$expander = new ShortUrlExpander($request);
// Enables using /cache in request path to mimic a pass-through file serve.
$params = $expander->parsePathInfo();
if (null !== $params) {
    // this will convert rewritten path to request with query params
    $expander->injectParamsToRequest($params['queryString'], $params['filename']);


URL shortcuts can be combined using - (dash) character. For example f100x100-q50-g1-p0 stands for fit=100x100&quality=50&greyscale=1&progressive=0.

Query attribute Shortcut letter
align a
fit f
flip m
crop c
width w
height h
background b
greyscale g
blur l
quality q
progressive p
interlace i
sharpen s
contrast (only from 0 to 100) k
no_process (do not process and load image in memory, allows optimizers) n

Use pass-through cache

Intervention request can save your images in a public folder to let Apache or Nginx serve them once they’ve been generated. This can reduce time-to-first-byte as PHP is not called any more.

  • Make sure you have configured Apache or Nginx to serve real files before proxying your request to PHP. Otherwise this could lead to file overwriting!
  • Pass-through cache is only available if you are using ShortUrlExpander to mimic a real image path without any query-string.
  • Your cache folder must be public (in your document root), so your documents will be visible to anyone. If your images must be protected behind a PHP firewall, you should not activate pass-through cache.
  • Garbage collector won’t be called because cached image won’t be served by your PHP server anymore but Apache or Nginx
  • Pass-through cache will save image for the first time at the real path used in your request, make sure it won’t overwrite any application file.

Define your configuration cache path to a public folder:

$conf = new Configuration();
$conf->setCachePath(APP_ROOT . '/cache');

Then enable the ShortUrlExpander and ignore your cache path to process only path info after it.

$expander = new ShortUrlExpander($request);
// Enables using /cache in request path to mimic a pass-through file serve.

Convert to webp

Make sure your PHP is compiled with WebP image format.

Intervention Request can automatically generated webp images by appending .webp to an existing image file.

Use /image.jpg.webp for /image.jpg file.

Intervention Request will look for a image file without .webp extension and throw a 404 error if it does not exist.

Force garbage collection

Using command-line

bin/intervention gc:launch /path/to/my/cache/folder --log /path/to/my/log/file.log

Extend Intervention Request

Intervention Request uses Processors to alter original images. By default, each available operation is handled by one AbstractProcessor inheriting class (look at the src/Processor folder).

You can create your own Processors and override default ones by injecting an array to your InterventionRequest object.

 * Handle main image request with a
 * custom list of Processors.
$iRequest = new InterventionRequest(
        new Processor\WidenProcessor(),
        // add or replace with your own Processors

Be careful, Processors position in this array is very important, please look at the default one in InterventionRequest.php class. Resizing processors should be the first, and quality processors should be the last as image operations will be done following your processors ordering.

Add custom event subscribers

You can create custom actions if you need to optimize/alter your images before they get served using ImageSavedEvent and Symfony event system :

Create a class implementing ImageEventSubscriberInterface and, for example, listen to ImageSavedEvent::NAME

public static function getSubscribedEvents()
    return [
        ImageSavedEvent::class => 'onImageSaved',

This event will carry a ImageSavedEvent object with all you need to optimize/alter it. Then, use $interventionRequest->addSubscriber($yourSubscriber) method to register it.

Available events

Event name Description
RequestEvent::class Main request handling event which handles quality and image processing and caching.
ImageBeforeProcessEvent::class Before Image is being processed.
ImageAfterProcessEvent::class After Image has been processed.
ImageSavedEvent::class After Image has been saved to filesystem with a physical file-path. This event is only dispatched if caching is enabled.
ResponseEvent::class After Symfony’s response has been built with image data. (Useful to alter headers)

Listener examples

  • WatermarkListener will print text on your image
  • KrakenListener will optimize your image file using external service
  • TinifyListener will optimize your image file using external service
  • JpegTranListener will optimize your image file using local jpegtran binary

Of course, you can build your own listeners and share them with us!


If your Intervention-request throws errors like that one:

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 5184 bytes).

It’s because you are trying to process a too large image. The solution is too increase your memory_limit PHP setting over 256M. You can edit this file in your server php.ini file.

You can use ini_set('memory_limit', '256M'); in your index.php file if your hosting plan allows you to dynamically change PHP configuration.

In general, we encourage to always downscale your native images before using them with Intervention-request. Raw jpeg images coming from your DSLR camera will give your PHP server a very hard time to process.



If you have jpegoptim installed on your server, you can add it to your configuration



If you have pngquant installed on your server, you can add it to your configuration

$conf->setLossyPng(true); // use palette lossy png compression - default: false


If you have oxipng installed on your server, you can add it to your configuration



If you have pingo installed on your server and Wine, you can add it to your configuration

$conf->setLossyPng(true); // use palette lossy png compression - default: false
$conf->setNoAlphaPingo(true); // Remove png transparency to compress more - default: false

If you have subscribed to a paid plan, you can add the dedicated KrakenListener to send your resized images over the external service.

$iRequest->addSubscriber(new \AM\InterventionRequest\Listener\KrakenListener(

Pay attention, that images will be sent over API, it will take some additional time.

If you have subscribed to a paid plan, you can add the dedicated TinifyListener to send your resized images over the external service.

$iRequest->addSubscriber(new \AM\InterventionRequest\Listener\TinifyListener(

Pay attention, that images will be sent over API, it will take some additional time.


If you want to use your system jpegtran or the Mozjpeg one, you can use the JpegTranListener.

$iRequest->addSubscriber(new \AM\InterventionRequest\Listener\JpegTranListener(

Optimization benchmark

With default quality to 90%.
AVIF conversion only supports custom compiled ImageMagick and only support lossless encoding.

Url PHP raw + lossy jpegoptim mozjpeg (jpegtran) WebP (90%) WebP (85%) AVIF (100%)
/test/images/testUHD.jpg?width=2300 405 kB 168 kB 187 kB 395 kB 390 kB 235 kB 155 kB 94 kB
/test/images/testUHD.jpg?width=1920 294 kB 132 kB 134 kB 285 kB 282 kB 176 kB 115 kB 71 kB
/test/images/rhino.jpg?width=1920 642 kB 278 kB 534 kB 598 kB 596 kB 564 kB 429 kB 398 kB
/test/images/rhino.jpg?width=1280 325 kB 203 kB 278 kB 303 kB 301 kB 295 kB 229 kB 227 kB
Url PHP raw pngquant oxipng + lossy WebP (100%) WebP (85%) AVIF (100%)
/test/images/testPNG.png 292 kB 167 kB 288 kB 142 kB 186 kB 28 kB 11.7 kB


Intervention Request is handcrafted by Ambroise Maupate under MIT license.

Have fun!


Copy index.php to dev.php then launch PHP server command using router.php as router.

php -S -t web router.php 

Then open in your browser. You should be able to test intervention-request with ShortUrl enabled.

If you want to test pass-through cache, uncomment dev.php lines 46 and 56 and open instead. First time request will be serve by PHP (look up at response headers), then following requests will be handled directly by your server (no more Intervention Request headers).


A customizable Intervention Image wrapper to use simple image re-sampling features over urls and a configurable cache.





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