An array is a collection of data items of the same data type. And it is also known as a subscript variable.

Example:

<?php
$age = array("Virat"=>"35", "Arshdeep"=>"37", "Rohit"=>"43");
echo "Virat is " . $age['Virat'] . " years old.";
?>

There are three different kinds of arrays.

1. Numeric Array

These are arrays with a numeric index where values are stored and accessed in a linear fashion.

Example:

<?php
$bike = array("TVS", "YAMAHA", "RAJDOOT");
echo "I like " . $bike[0] . ", " . $bike[1] . " and " . $bike[2] . ".";
?>

2. Associative Array

These are arrays with string as an index where it stores element values associated with key values.

Example:

<?php
$age = array("Ben"=>"35", "Stokes"=>"37", "Jimi"=>"43");
echo "Ben is " . $age['Ben'] . " years old.";
?>

3. Multidimensional Arrays

A multidimensional array is an array containing one or more arrays where values are accessed using multiple indices.

Example:

<?php
$cars = array (
  array("Volvo",22,18),
  array("BMW",15,13),
  array("Saab",5,2),
  array("Land Rover",17,15)
);
echo $cars[0][0].": In stock: ".$cars[0][1].", sold: ".$cars[0][2].".<br>";
?>