Paper

Hassle-free HTML to PDF conversion abstraction library.

Installation

composer require asyncphp/paper

For best results, you should also install Prince and WKHTMLtoDPF. To run the tests, you'll also need to install diff-pdf. If you don't have the latter installed, you'll not be able to run the tests. If you don't have the former installed, the relevant tests will be skipped, and drivers unusable.

Usage

You can use any of the drivers directly:

use AsyncInterop\Loop;
use AsyncPHP\Paper\Driver\DomDriver;
use AsyncPHP\Paper\Runner\AmpRunner;

Loop::execute(Amp\wrap(function() use ($sample) {
    $driver = new DomDriver();
    $runner = new AmpRunner();

    $promise = $driver
        ->html($sample)
        ->size("A4")
        ->orientation("portrait")
        ->dpi(300)
        ->render($runner);

    $results = yield $promise;
}));

However, it's must easier to use the factory, to create pre-configured drivers:

use AsyncPHP\Paper\Factory;

$config = [
    "driver" => "dom",

    "dom" => [
        "options" => [
            "fontDir" => __DIR__ . "/fonts",
            // https://github.com/dompdf/dompdf/blob/master/src/Options.php
        ],
    ],

    "prince" => [
        "binary" => "/opt/prince/bin/prince",
        "tempPath" => __DIR__,
        "options" => [
            "--no-compress",
            "--http-timeout" => 10,
            // https://www.princexml.com/doc/command-line/#command-line
        ],
    ],

    "webkit" => [
        "binary" => "/usr/local/bin/wkhtmltopdf",
        "tempPath" => __DIR__,
        "options" => [
            "--grayscale",
            "--javascript-delay" => 500,
            // http://wkhtmltopdf.org/usage/wkhtmltopdf.txt
        ],
    ],

    "runner" => "amp",
];

$factory = new Factory();
$driver = $factory->createDriver($config);
$runner = $factory->createRunner($config);

yield $driver->html($sample)->render($runner);

Paper takes an async-first approach. Operations, like rendering PDF files, are particularly suited to parallel processing architecture. You may be stuck rending PDF files in a synchronous architecture, in which case you can use the SyncDriver decorator:

$driver = new SyncDriver(new DomDriver());

// ...or with the factory

$driver = $factory->createDriver([
    "driver" => "dom",
    "sync" => true,
]);

Drivers

Here's a list of the drivers to currently support:

DOMPDF

• Requires command-line utilities: no
• Supports modern CSS: no
• Supports modern JS: no
• Produces vector files: yes
• Open + free: yes

WKHTMLtoDPF

• Requires command-line utilities: yes
• Supports modern CSS: yes
• Supports modern JS: yes
• Produces vector files: yes
• Open + free: yes

Prince

• Requires command-line utilities: yes
• Supports modern CSS: yes
• Supports modern JS: yes
• Produces vector files: yes
• Open + free: no

Runners

Paper supports Amp and React, to package and run the async code. You have to install one of the following library groups:

Amp

composer require amphp/loop
composer require amphp/parallel
composer require async-interop/event-loop

React

composer require react/event-loop
composer require react/child-process
composer require jeremeamia/superclosure

Take a look at the examples folder to find out more about using the async drivers.

Roadmap

• Setters for default margin
• Setters for header HTML
• Setters for footer HTML
• More drivers (especially DocRaptor – a SaaS version of Prince)

Versioning

This library follows Semver. According to Semver, you will be able to upgrade to any minor or patch version of this library without any breaking changes to the public API. Semver also requires that we clearly define the public API for this library.

All methods, with public visibility, are part of the public API. All other methods are not part of the public API. Where possible, we'll try to keep protected methods backwards-compatible in minor/patch versions, but if you're overriding methods then please test your work before upgrading.