Pieter Hordijk PeeHaa

cv-pls: [Backlog](http://cvbacklog.gordon-oheim.biz/) ([mirror](http://cvbacklog.herokuapp.com/)) | [Meaning](http://gist.github.com/1689430) | [Chrome/Firefox Addon](https://github.com/cv-pls/) | [Cat Content](http://goo.gl/i04rR) | Snippets: [Mysql](https://gist.github.com/3881905) | Reference: [Errors](http://stackoverflow.com/q/12769982/367456) | [Operators](http://stackoverflow.com/questions/3737139/reference-what-does-this-symbol-mean-in-php)

Basic selectors:

http://jsfiddle.net/PeeHaa/VtbtT/

Arrays can be seen as lists which can hold information. Arrays in PHP can holds all types of values like scalar values, objects or even other arrays.

Declaring an initializing arrays

First lets see how we can declare an empty array:

<?php
$theArray = array();

test 1
test 2

<?php
function curPageURL() {
 $pageURL = 'http';
 if ($_SERVER["HTTPS"] == "on") {$pageURL .= "s";}
 $pageURL .= "://";
 if ($_SERVER["SERVER_PORT"] != "80") {
  $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
 } else {
  $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];

}

Functions

PHP already has a lot of [built-in functions][builtin-functions]. Besides the built-in functions already provided by PHP it is also possible to define your own functions. Functions can be used to run the same code multiple times without having to add the code multiple times. It can also be used to organize your code. Generally speaking a function is a piece of code with an input, some defined actions based on the input and an output. An example of function that calculates the differences in the age of two people is:

function getAgeDifference($age1, $age2)
{
    return abs($age1 - $age2);
}

	<?php
	function xpath_match_all($query, $html = '')
	{
	static $dom;
	static $xpath;
	static $content;

	if (!$dom) {
	$dom = new DOMDocument;
	}

	<?php // always use full php tags

	//require 'connect.inc.php';
	$dbConnection = new PDO('mysql:dbname=dbtest;host=127.0.0.1;charset=utf8', 'user', 'pass');
	$dbConnection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
	$dbConnection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

	// mysql_* function?? Eeeeek
	function query($query)
	{

	<?php
	/**
	* Implementation of the oAuth1 signature spec: http://oauth.net/core/1.0a/ *
	*/
	namespace Oauth1\Signature;

	class TwitterSignature implements \Oauth\Signature
	{
	protected $signatureAlgorithm;
	protected $httpMethod;