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SitePoint PHP Blog:
Writing Async Libraries – Let’s Convert HTML to PDF
Feb 21, 2017 @ 09:58:05

The SitePoint PHP blog has another tutorial posted from author Christopher Pitt looking at writing async libraries with PHP. In this particular article he focuses on just one of many tasks an asynchronous library could perform: converting HTML to PDF documents.

I can barely remember a conference where the topic of asynchronous PHP wasn’t discussed. I am pleased that it’s so frequently spoken about these days. There’s a secret these speakers aren’t telling, though: "Making asynchronous servers, resolving domain names, interacting with file systems: these are the easy things. Making your own asynchronous libraries is hard. And it’s where you spend most of your time!"

The reason those easy things are easy is because they were the proof of concept – to make async PHP competitive with NodeJS. [...] Today, we’re going to look at a few ways to make your application code work well in an asynchronous architecture. Fret not – your code can still work in a synchronous architecture, so you don’t have to give anything up to learn this new skill. Apart from a bit of time…

He starts with some theory about things in the async world including callbacks, promises and what they might look like in PHP-land. He then starts in on the creation of the PDF files, creating a "Driver" class to handle some of the logic and using the Dompdf library to do the heavy lifting (the conversion from HTML to PDF). He walks through the code required for this class then moves on to the code, using the Amp project, to handle the async operations. He then creates a simple set of web accessible endpoints that call the Driver class with some basic attributes and performing the conversion. He ends the post talking about porting the parallel driver to other systems (such as ReactPHP) and a few simple steps if you need to move back to the synchronous world.

tagged: asynchronous conversion dompdf html pdf tutorial amp

Link: https://www.sitepoint.com/writing-async-libraries-lets-convert-html-to-pdf/

PHPMaster.com:
Convert HTML to PDF with Dompdf
Aug 15, 2013 @ 10:39:16

On PHPMaster.com there's a new tutorial from Shameer C showing you how to use Dompdf to convert HTML to PDFs. The handy library makes it (relatively) simple to automatically generate the documents without the need to know the internal PDF file structure.

PDF is a standard format originally created by Adobe for representing text and images in a fixed-layout document. It’s not uncommon for a web application to support downloading data, such as invoices or reports, in PDF format, so in this article we’ll go through how we can easily generate PDF documents using PHP.

He starts off with the installation (via Composer) and the creation of a simple "Hello World" document, showing how to "stream" it into a PDF file. He also includes some more advanced usage - loading an external HTML, drawing lines, changing fonts, adding page numbers and additional text to the page.

tagged: html pdf convert tutorial dompdf adobe

Link: http://phpmaster.com/convert-html-to-pdf-with-dompdf

Raymond Kolbe's Blog:
DOMPDF in ZF2
Jul 06, 2012 @ 10:08:27

Raymond Kolbe has a recent post to his blog about using the DOMPDF library to generate PDFs in a Zend Framework 2 application.

If you’re using Zend Framework 2 (beta 4) and need to easily generate PDFs, and you’d like to generate those PDFs from an HTML template, then boy do I have some good news for you! For those of you who have dealt with generating dynamic PDFs, you know how much of a pain in the ass it can be (e.g. dealing with x, y coordinates, word-wrap (or lack of), etc.). There are a few options out there, some paid, some free, but none of them are as nice as DOMPDF (simple API, powerful, and free). The true power behind DOMPDF comes from rendering standard HTML/CSS files instead of having to write ugly and unmanageable code.

He includes a simple example showing how to use the library to create a basic PDF document (containing an HTML string) and how to port that same thing over to work in ZF2 via a custom DOMPDFModule (a ViewModel). You can find out more about this module in it's README on github.

tagged: dompdf zendframework2 tutorial viewmodel

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