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Associative Array (PHP and C# Cross Reference Guide)

By Mike Prestwood

PHP versus C#: A side by side comparison between PHP and C#.

Data Structures

Data structures allow you to store and work with data. Common data structures include arrays, associative arrays, etc.

Associative Array

[Other Languages]

A set of unique keys linked to a set of values. Each unique key is associated with a value. Think of it as a two column table. MyArray['CA'] = 'California' MyArray['AR'] = 'Arizona'

Languages Focus

Associative arrays are also known as a dictionary or a hash table in other languages.

PHP:

Declare associative array with initial known values. You can also add to associative array. (You can just assign values without ever declaring it too!)

Syntax Example:

$prices = array( 'Tires'=>100, 'Spark Plugs'=>4 );
$prices['Oil'] = 10;

echo "Tires=" . $prices['Tires'] . "<br>";
echo "Oil=" . $prices['Oil'] . "<br>";

PHP Associative Array

C#: Dictionary

Syntax Example:

//using System.Collections.Generic;

Dictionary <String, String> airports = new Dictionary <String, String>();

airports.Add("LAX", "Los Angeles"); 
airports.Add("SFO", "San Francisco"); 
airports.Add("SAN", "San Diego");

MessageBox.Show(airports["LAX"]);

C# Associative Array (Dictionary)