The PHP associative arrays are lists or groups that already have multiple values grouped by indexes or serials.
The basic array syntax would be like the below.
array( ... ); // or [ ... ]
PHP Associative Arrays Overview
The associative array contains a list of values grouped by labels. So each value inside the associative array has a label name.
The associative array can be written as the below.
<?php $package = array( "book" => "Rich Dad", "softs" => "Anti Virus", "food" => "Cheese", "tools" => "Pencil", "pc" => "Laptop", "paper" => "Printed Paper" ); ?>
These labels also named as keys.
Anyway, in the following sections I will show you how to create, add, delete elements from the associative array.
Also, you can access all elements by calling it by the square brackets  for example.
<?php echo $package["key1"]; // value 1 ?>
PHP Associative Arrays: Creating Elements
To create associative array, you have two ways as the below.
<?php $package = array( "user" => "Peter", "email" => "firstname.lastname@example.org ); ?>
And you can add more elements using the square brackets  as the below.
<?php $package["age"] = "35 years"; $package["city"] = "Liverpool"; ?>
So each new element has a new different key, Also you can update the array using square brackets  by calling the same key name of the array element. For example.
<?php $package["user"] = "Montasser"; ?>
In the following section you will learn how to delete an element from the associative array.
Delete an Element From the Associative Array
As I mentioned, the associative array has a key name for each element. So you can delete an element using the key name.
Here I will use unset() PHP built-in function to remove an array element.
<?php // delete the email element from the array unset( $array["email"] ); // will delete an element ?>
To loop on the associative array you have to read this article.
The associative array contains a list of values grouped by labels. So each value inside the associative array has a label name or key name.
You can access the associative array by calling it by its key name like this:
$array["email"]. Also, to delete an element from the associative array you have to use unset().