nikic

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:

spacecowb0y

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|
  config.vm.box = "precise32"
  config.vm.box_url = "http://files.vagrantup.com/precise32.box"
  config.vm.network  :forwarded_port, guest: 3000, host: 3000

  config.vm.hostname = "ruby-dev-server"
  config.vm.provision :shell, path: "install.sh"

miguel-vila

Jessica Kerr "Functional Principles for Object Oriented Development"

Principles

• Data In, Data Out: (Most) Functions should only depend on its parameters and should do nothing but produce output.
  • Testable: No need to setup extern dependencies or tear them down after testing
  • Easier to understand: Only local context dependent
  • A good "data in, data out" function should:
    • don't access global state
    • don't modify the input
    • don't bother the rest of the world
• Inmutability

lttlrck

git branch -m old_branch new_branch         # Rename branch locally    
git push origin :old_branch                 # Delete the old branch    
git push --set-upstream origin new_branch   # Push the new branch, set local branch to track the new remote

rosstuck

<?php

trait EventGenerator
{
    protected $pendingEvents = array();

    protected function raise($event)
    {
        $this->pendingEvents[] = $event;
    }

danvine

#!/usr/bin/env bash
# Be sure to install the apiary gem; https://github.com/apiaryio/apiary-client
# gem install apiary

# You'll need to get a token here; https://login.apiary.io/tokens
APIARY_API_KEY=

# Your apiname here; docs.$APINAME.apiary.io
APINAME=

alexbilbie

Setup

$ composer install
$ php -S localhost:8000

Version 1.0 call:

curl -X "GET" "http://localhost:8000/index.php/foo" -H "Accept: 1.0"