Filter an array of objects

Quite often I might have an array of objects, be it from a db query or some json object, and I want to filter that list in a particular way.  Lots of times I would find myself doing the same old thing; creating a new array, looping and looping until all I had left was what matched my filter.

I’m sure you’ve been there and done it a thousand times, too.

Well, this little function should help that task out a lot!

Say I had an array of people objects and wanted only those people who’s name was Bob and was aged 35, I could do something as simple as:

$filtered = ofilter($items, ['name' => 'Bob', 'age' => 35]);

Or maybe something a little tricker; I wanted to get anyone whose age was between 18 and 35 (inclusive):

$filtered = ofilter($items, ['age' => function($age) { return ($age >= 18 && $age < = 35); }]);

Pretty easy, eh?

Here’s the code – it’s a GitHub gist, so feel free to fork and improve!
Continue reading “Filter an array of objects”

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Calculate aspect ratio

This is a handy little function I’ve used a few times to calculate the aspect ratio of an image or video.  Simply give it the width and height and it’ll give you the aspect ratio.

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A PHP extension to control GPIO on the RaspberryPi – my BrightonPHP talk

A while ago now (back in February!) I did a talk about writing an extension using Zephir to interact with the RaspberryPi’s GPIO.  The extension itself wraps around the wiringPi library and it makes it really easy to write PHP scripts that send output and gather input from the GPIO.

Here are the slides (use left/right arrow keys to navigate):

Full-sized version of the slides

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JW Player thumbnail creator now on Packagist and via Composer

Just a quick note to say that my thumbnail and VTT creator for JW Player, a script to help extract thumbnails from a video and present them in JW Player a a toolbar preview, has now got the ability to be included in your project via composer. Just use:

composer require amnuts/jwplayer-thumbnail-preview-generator

If you want, you can also browse for it on Packagist.

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phpiwire updated – now with PWM!

I’ve pushed a few changes to phpiwire can now use the PWM functions in wiringPi.  You can use either the hardware PWM pins or any of the GPIOs by using software PWM.  A couple new examples of how to do this have also been added to the repository.

With software PWM comes the requirement to include pthreads, so that’s also linked when you compile the zephir extension.

I’d recommend you do a full clean first before compiling with:

zephir fullclean
zephir install
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Phpiwire: a PHP extension (written using Zephir) for controlling the Raspberry Pi GPIO

So it’s been a while since my lightening talk on Zephir and I realized I hadn’t really done anything to try to learn it a little more in-depth.  Coincidentally, I was recently going through a drawer and realized that one of my Raspberry Pi’s was in there just begging to be put to some use (seriously, I could practically hear it weep).  So I thought that the only thing to do was to attempt to write an extension using Zephir so that I could control the GPIO via PHP.  I mean, isn’t it obvious? Continue reading “Phpiwire: a PHP extension (written using Zephir) for controlling the Raspberry Pi GPIO”

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Opache gui update and now on Packagist

I’ve just pushed to github a big overhaul of the opcache gui script. It comes with a sweeping set of changes which also includes using react.js to power some of the interface to really enhance the real-time updates. (OK, it was really just an excuse for me to learn a little about react.js but I think it was worth it!)

I’ve also put the opcache gui and the php error log gui up on packagist – my first packages on there!  Check ’em out:

https://packagist.org/packages/amnuts/opcache-gui
https://packagist.org/packages/amnuts/phperror-gui

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Create video thumbnail previews for JW Player

JWPlayer is a fantastic video player for the web. One of the great features it provides is the ability to show thumbnail previews of the video as you slide along the toolbar timeline, much the same way that YouTube and the like allow.

Generating the thumbnail images is not quite so easy unless you have ffmpeg installed and know a bit about the command line options. I got a little frustrated myself having to come up the with the command line magic whenever I needed it, and so the JW Player thumbnail preview generator was born!

It’s a simple command line tool, written in PHP, that allows you to whip up the thumbnails and generate the required VTT file with a command as simple as:

php thumbnails.php -i "/input/video.mp4"

OK, so you still need to have ffmpeg installed on your machine – not much I can do about that one, sorry! – but at least generating the files is now much easier!

You can generate the individual thumbnails or have them coalesced into  sprite sheet, and generate a random poster image. Full instructions are on my GitHub account; so go, fork, improve, and feel free to give any feedback.

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Effective, clean UI for viewing the PHP error log

Example usage

Recently at work I found myself trawling through the PHP error log file and found that all the lines of text were starting to blur after a while. Thinking there had to be a better way over viewing the log file, and following on from my single-file opcache viewer gui, I decided to knock out something for viewing the error log file as well.

With this single-file error log gui it will only show the error once and then tell you how many times it appears in the log. It will allow you to narrow down your search of errors by being able to hide the different types or sort in different ways, and it will also allow you to search results based on particular file paths.

I’ve pushed the code up to my GitHub account, so please feel free to fork and improve and/or give feedback.

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Easy page scraping with Zend\Dom (from Zend Framework 2)

The other day I was interested in getting some information from the sussex.academia.edu site, specifically I wanted a list of tags for each of the faculty members. Now, this sounds relatively easy except when you consider that initial page contains a list of links to various schools/departments people have listed, and then under each of those pages you have different fieldsets with different types of people on them (and I was only interested in the faculty fieldset), and each person may or may not have tags and even then those tags may be hidden behind some javascript so that you click and view all of the tags… When you consider all of that you would be forgiven in thinking that it’s actually quite a daunting task!

Let me assure you, though, that by using Zend\Dom from the Zend Framework 2 library it’s actually a really simple task. In fact, I did it in around 20 lines of code.

So let’s start by looking at the code and then break it down a little more.

Continue reading “Easy page scraping with Zend\Dom (from Zend Framework 2)”

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