Snappy

Snappy is a PHP5 library allowing thumbnail, snapshot or PDF generation from a url or a html page. It uses the excellent webkit-based wkhtmltopdf and wkhtmltoimage available on OSX, linux, windows.

You will have to download wkhtmltopdf 0.12.0 in order to use Snappy.

Installation using Composer

Add to your composer.json:

{
    "require" :  {
        "knplabs/knp-snappy": "*"
    }
}

Usage

<?php

require_once '/path/to/snappy/src/autoload.php';

use Knp\Snappy\Pdf;

$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');

// or you can do it in two steps
$snappy = new Pdf();
$snappy->setBinary('/usr/local/bin/wkhtmltopdf');

// Display the resulting pdf in the browser
// by setting the Content-type header to pdf
$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="file.pdf"');
echo $snappy->getOutput('http://www.github.com');

// Merge multiple urls into one pdf
// by sending an array of urls to getOutput()
$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="file.pdf"');
echo $snappy->getOutput(array('http://www.github.com','http://www.knplabs.com','http://www.php.net'));

// .. or simply save the PDF to a file
$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
$snappy->generateFromHtml('<h1>Bill</h1><p>You owe me money, dude.</p>', '/tmp/bill-123.pdf');

// Pass options to snappy
// Type wkhtmltopdf -H to see the list of options
$snappy = new Pdf('/usr/local/bin/wkhtmltopdf');
$snappy->setOption('disable-javascript', true);
$snappy->setOption('no-background', true);
$snappy->setOption('allow', array('/path1', '/path2'));
$snappy->setOption('cookie', array('key' => 'value', 'key2' => 'value2'));

wkhtmltopdf binary as composer dependencies

If you want to download wkhtmltopdf and wkhtmltoimage with composer you add to composer.json:

{
    "require": {
        "h4cc/wkhtmltopdf-i386": "0.12.x",
        "h4cc/wkhtmltoimage-i386": "0.12.x"
    }
}

or this if you are in 64 bit based system:

{
    "require": {
        "h4cc/wkhtmltopdf-amd64": "0.12.x",
        "h4cc/wkhtmltoimage-amd64": "0.12.x"
    }
}

And then you can use it

<?php

use Knp\Snappy\Pdf;

$myProjectDirectory = '/path/to/my/project';

$snappy = new Pdf($myProjectDirectory . '/vendor/h4cc/wkhtmltopdf-i386/bin/wkhtmltopdf-i386');

// or

$snappy = new Pdf($myProjectDirectory . '/vendor/h4cc/wkhtmltopdf-amd64/bin/wkhtmltopdf-amd64');

Error handling

From: wkhtmltopdf/wkhtmltopdf#1502, here is a table that explain exit codes returned by the wkhtmltoimage binary:

ExitCode	Explanation
0	All OK
1	PDF generated OK, but some request(s) did not return HTTP 200
2	Could not something something
X	Could not write PDF: File in use
Y	Could not write PDF: No write permission
Z	PDF generated OK, but some JavaScript requests(s) timeouted
A	Invalid arguments provided
B	Could not find input file(s)
C	Process timeout

When you generate for example an Image, if the exit code of wkhtmltoimage is not 0 (All OK), Snappy raises a RuntimeException with the wkhtmltoimage exit code as code property of the exception.

As explain here KnpLabs/KnpSnappyBundle#33, in some case, you are ok with the exit code 1, because the generated image result is acceptable even if some assets return a 404 http status.

Example

try {
    $snappy = new Image('/usr/local/bin/wkhtmltoimage');
    $snappy->generateFromHtml($someHtml, '/tmp/preview.jpg');
} catch (\RuntimeException $e) {
    //Generation terminated, but it should be in degraded mode
    if (1 == $e->getCode()) {
        $this->logger->warning();
    } else {
    // Generation failed
        $this->logger->error();
        throw $e;
    }
}

Credits

Snappy has been originally developed by the KnpLabs team.