Bill Hance billhance

Why objects (usually) use less memory than arrays in PHP

This is just a small post in response to [this tweet][tweet] by Julien Pauli (who by the way is the release manager for PHP 5.5). In the tweet he claims that objects use more memory than arrays in PHP. Even though it can be like that, it's not true in most cases. (Note: This only applies to PHP 5.4 or newer.)

The reason why it's easy to assume that objects are larger than arrays is because objects can be seen as an array of properties and a bit of additional information (like the class it belongs to). And as array + additional info > array it obviously follows that objects are larger. The thing is that in most cases PHP can optimize the array part of it away. So how does that work?

The key here is that objects usually have a predefined set of keys, whereas arrays don't:

New features in PHP 5.5

This is only a summary. For a full list of changes see the NEWS file.

Feature	RFC / announcement	Author

Bundled ZendOptimizer+ as OPcache	https://wiki.php.net/rfc/optimizerplus	zeev

Open Source Search Comparison

Elasticsearch

Main Web: http://www.elasticsearch.org/
Development URL: https://github.com/elasticsearch/elasticsearch
License: Apache 2
Environment: Java

Elasticsearch was created in 2010 by Shay Banon after forgoing work on another search solution, Compass, also built on Lucene and created in 2004.

How-to setup a simple git push deployment

These are my notes basically. At first i created this gist just as a reminder for myself. But feel free to use this for your project as a starting point. If you have questions you can find me on twitter @thomasf https://twitter.com/thomasf This is how i used it on a Debian Wheezy testing (https://www.debian.org/releases/testing/)

Discuss, ask questions, etc. here https://news.ycombinator.com/item?id=7445545

	<?php

	class CSVIterator extends SPLFileObject
	{
	protected $first_row = true;
	protected $columns;

	public function __construct ($filename, $delimiter = ',')
	{
	parent::__construct($filename);

	// FizzBuzz solution with one comparison:
	// Bitwise operations, using predefined 0-15 numbers mask

	// live demo: http://jsfiddle.net/TbAuQ/
	// source: http://www.zoharbabin.com/which-fizzbuzz-solution-is-the-most-efficient

	var words = [undefined, "Fizz", "Buzz", "FizzBuzz"],
	mask = 810092048, //11 00 00 01 00 10 01 00 00 01 10 00 01 00 00
	c = 0;

	<?php

	namespace LM\Bundle\CoreBundle\Controller;

	use Symfony\Component\HttpFoundation\Request;
	use Symfony\Component\HttpFoundation\Response;
	use Symfony\Bundle\FrameworkBundle\Controller\Controller;

	class AppController extends Controller
	{

	# Rails Stuff
	alias stoprails='kill -9 $(lsof -i :3000 -t)'
	alias startrails='rails server -d'
	alias restartrails='stopRails && startRails'

	#Check PHP For Erroes
	alias phpcheck='find ./ -name \*.php \| xargs -n 1 php -l'

	# ROT13-encode text. Works for decoding, too! ;)
	alias rot13='tr a-zA-Z n-za-mN-ZA-M'

	/*

	Programmatic Mocha code - This is used by a codeship
	test to both start an expressjs app, setup routes and
	run a suite of mocha tests.

	Hint: Place this in the root of the project. Call from
	test package.js or setup with > node mocha.js

	Also see: https://gist.github.com/d1b1/7949456 (Expressjs + Swagger App)