Mehdi Chaouch mehdichaouch

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:

"Help, I keep getting a 'Permission Denied (publickey)' error when I push!"

This means, on your local machine, you haven't made any SSH keys. Not to worry. Here's how to fix:

Open git bash (Use the Windows search. To find it, type "git bash") or the Mac Terminal. Pro Tip: You can use any *nix based command prompt (but not the default Windows Command Prompt!)
Type cd ~/.ssh. This will take you to the root directory for Git (Likely C:\Users\[YOUR-USER-NAME]\.ssh\ on Windows)
Within the .ssh folder, there should be these two files: id_rsa and id_rsa.pub. These are the files that tell your computer how to communicate with GitHub, BitBucket, or any other Git based service. Type ls to see a directory listing. If those two files don't show up, proceed to the next step. NOTE: Your SSH keys must be named id_rsa and id_rsa.pub in order for Git, GitHub, and BitBucket to recognize them by default.
To create the SSH keys, type ssh-keygen -t rsa -C "[email protected]". Th

Git

Global Settings

Related Setup: https://gist.github.com/hofmannsven/6814278
Related Pro Tips: https://ochronus.com/git-tips-from-the-trenches/
Interactive Beginners Tutorial: http://try.github.io/
Git Cheatsheet by GitHub: https://services.github.com/on-demand/downloads/github-git-cheat-sheet/

Reminder

Press minus + shift + s and return to chop/fold long lines!

	### pre-commit.sh

	# Store git index status
	git stash -q --keep-index

	PWD=`pwd`
	$PWD/bin/run_tests.sh

	# Store tests result
	RESULT=$?

	function run()
	{
	// Récupération des objets "Gamepad" connectés
	var gamepads = navigator.getGamepads();

	for (var i = 0, c = gamepads.length; i < c; ++i)
	{
	var pad = gamepads[i];

	pad.buttons; // Array de boutons

	#!/bin/bash

	DBUSER="dbuser"
	DBPASS="dbpass"
	DB="dbname"
	DUMPPATH="."

	mysqldump -u $DBUSER -p$DBPASS $DB > $DUMPPATH/$DB.sql
	git add $DUMPPATH/$DB.sql

	// Originally from http://webapps.stackexchange.com/questions/37408/google-docs-auto-updating-column-showing-last-modify-date
	function onEdit() {
	var s = SpreadsheetApp.getActiveSheet();
	var r = s.getActiveCell();
	if( r.getColumn() != 2 ) { //checks the column
	var row = r.getRow();
	var time = new Date();
	time = Utilities.formatDate(time, "GMT+02:00", "d.M.y, h:m");
	SpreadsheetApp.getActiveSheet().getRange('B' + row.toString()).setValue(time);
	};

	<?php

	/**
	* Convert a multi-dimensional array into a single-dimensional array.
	* @author Sean Cannon, LitmusBox.com \| [email protected]
	* @param array $array The multi-dimensional array.
	* @return array
	*/
	function array_flatten($array) {
	if (!is_array($array)) {

	# Show PHP errors
	sed -i -r -e 's/short_open_tag = On/short_open_tag = Off/g' /etc/php5/fpm/php.ini
	sed -i -r -e 's/error_reporting = E_ALL & ~E_DEPRECATED/error_reporting = E_ALL \| E_STRICT/g' /etc/php5/fpm/php.ini
	sed -i -r -e 's/display_errors = Off/display_errors = On/g' /etc/php5/fpm/php.ini

	#!/bin/sh
	#
	# Automatically adds branch name and branch description to every commit message.
	# Unless we are on the master or develop branch.
	#
	NAME=$(git branch \| grep '' \| sed 's/ //')
	DESCRIPTION=$(git config branch."$NAME".description)
	TEXT=$(cat "$1" \| sed '/^#.*/d')