Eugene Myazin meniam

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:

BEM-XJST

Это БЭМ-ориентированные хелперы над стандартным XJST-синтаксисом. Сюда входит:

синтаксический сахар для подпредикатов про БЭМ предметную область
возможность писать вложенные шаблоны
синтаксический сахар для apply по какой-то mode (apply(this._mode = 'bla'))
ключевое слово applyCtx (синтаксический сахар для applyNext(this.ctx = { some: 'new' }))

Подпредикаты про БЭМ

What this?

So one of the painful points of using docker on OS X is that you need to run a virtualbox VM, which often suffers from performance issues. With xhyve, a OS X virtualization system, and docker-machine-xhyve you can now have docker use the native OS X hypervisor to run containers.

No more dealing with virtualbox shenanigans!

In this script, I've also set up a way to autoconfigure terminal sessions to load docker's environment vars (dependent on docker-machine) so you do not have to run eval $(docker-machine env whatever) every time you open a new terminal window.

Requirements

Installing Sentry on Debian

Install aptitude packages

sudo apt-get update
sudo apt-get install python python-setuptools python-pip python-dev libxslt1-dev libxml2-dev libmysqlclient-dev

Install and activate virtualenv

sudo pip install -U virtualenv
virtualenv /clients/sentry/

source /clients/sentry/bin/activate

	<?php

	/*
	echo plural_form(42, array('арбуз', 'арбуза', 'арбузов'));
	*/

	function plural_form($n, $forms) {
	return $n%10==1&&$n%100!=11?$forms[0]:($n%10>=2&&$n%10<=4&&($n%100<10\|\|$n%100>=20)?$forms[1]:$forms[2]);
	}

	location /resize {
	alias /tmp/nginx/resize;
	set $width 150;
	set $height 100;
	set $dimens "";

	if ($uri ~* "^/resize_(\d+)x(\d+)/(.*)" ) {
	set $width $1;
	set $height $2;
	set $image_path $3;

	sudo apt-get update

	sudo apt-get install python-virtualenv
	sudo apt-get install python-dev
	sudo apt-get install postgresql
	sudo apt-get install postgresql-server-dev-9.3
	sudo apt-get install redis-server

	sudo -u postgres createuser -s sentry
	sudo -u postgres psql -c "alter user sentry with password 'sentry';"

	# Credit http://stackoverflow.com/a/2514279
	for branch in `git branch -r \| grep -v HEAD`;do echo -e `git show --format="%ci %cr" $branch \| head -n 1` \\t$branch; done \| sort -r

	// Use Gists to store code you would like to remember later on
	console.log(window); // log the "window" object to the console