Arrays in PHP

An array in PHP is actually an ordered map. A map is a type that associates values to keys.
This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more.

Example :  Indexed arrays without key

<?php

$array = array("jack", "Nakiya", "hello", "World");

var_dump($array);

?>

The above example will output:

array(4) {
  [0]=>
  string(3) "jack"
  [1]=>
  string(3) "Nakiya"
  [2]=>
  string(5) "hello"
  [3]=>
  string(5) "World"
}