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4.1.1 Indexed Arrays

$cars = array("Volvo", "BMW", "Toyota");

or the index can be assigned manually:

$cars[0] = "Volvo";
$cars[1] = "BMW";
$cars[2] = "Toyota";

The following example creates an indexed array named $cars, assigns three elements to it, and then prints a text containing the array values:

<?php
$cars = array("Volvo", "BMW", "Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>

To change the value of an array item, use the index number:

To change the value of an array item, use the index number:

$cars = array("Volvo", "BMW", "Toyota");
$cars[1] = "Ford";
var_dump($cars);

To loop through and print all the values of an indexed array, you could use a for loop, like this:

<?php
$cars = array("Volvo", "BMW", "Toyota");
$arrlength = count($cars);

for($x = 0; $x < $arrlength; $x++) {
  echo $cars[$x];
  echo "<br>";
}
?>

The key of an indexed array is a number, by default the first item is 0 and the second is 1 etc., but there are exceptions.
New items get the next index number, meaning one higher than the highest existing index.
So if you have an array like this:

$cars[0] = "Volvo";
$cars[1] = "BMW";
$cars[2] = "Toyota";

And if you use the array_push() function to add a new item, the new item will get the index 3:

array_push($cars, "Ford");
var_dump($cars);

But if you have an array with random index numbers, like this:

$cars[15] = "Volvo";
$cars[7] = "BMW";
$cars[14] = "Toyota";

And if you use the array_push() function to add a new item, what will be the index number of the new item?

array_push($cars, "Ford");
var_dump($cars);

For a complete reference of all array functions, go to the W3Schools.com complete PHP Array Reference.
The reference contains a brief description, and examples of use, for each function!

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