PHP Indexed Arrays

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Table of Contents

• PHP Indexed Arrays
  • PHP 1 Indexed Arrays
    • Example 1
  • PHP 2 Access Indexed Arrays
    • Example 2
  • PHP 3 Change Value
    • Example 3
  • PHP 4 Loop Through an Indexed Array
    • Example 4
  • PHP 5 Index Number
    • Example 5
  • PHP 6 Random Index Number
    • Example 6
  • Document
  • Reference

PHP 1 Indexed Arrays

<h4>Indexed_Arrays</h4>
<p>Create and display an indexed array:</p>
<pre>
<?php
$cars = array("Volvo", "BMW", "Toyota");
var_dump($cars);
?>
</pre>

Example 1

Result View Example

PHP 2 Access Indexed Arrays

To access an array item you can refer to the index number.

<h4>Access_Indexed_Arrays</h4>
<p>To access an array item you can refer to the index number.</p>
<?php
$cars = array("Volvo", "BMW", "Toyota");
echo $cars[0];
?>

Example 2

Result View Example

PHP 3 Change Value

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

<h4>Change_Value</h4>
<?php
$cars = array("Volvo", "BMW", "Toyota");
$cars[1] = "Ford";
var_dump($cars);
?>

Example 3

Result View Example

PHP 4 Loop Through an Indexed Array

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

<h4>Loop_Through_an_Indexed_Array</h4>
<?php
$cars = array("Volvo", "BMW", "Toyota");
foreach ($cars as $x) {
    echo "$x <br>";
}
?>

Example 4

Result View Example

PHP 5 Index Number

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.

<h4>Index_Number</h4>
<p>if you use the array_push() function to add a new item, the new item will get the index 3:</p>
<pre>
<?php
$cars[0] = "Volvo";
$cars[1] = "BMW";
$cars[2] = "Toyota";

array_push($cars, "Ford");
var_dump($cars);
?>
</pre>

Example 5

Result View Example

PHP 6 Random Index Number

If you assign a new value without an index number, PHP will automatically assign one for you.

<h4>Random_Index_Number</h4>
<pre>
<?php
$cars[5] = "Volvo";
$cars[7] = "BMW";
$cars[14] = "Toyota";

array_push($cars, "Ford");
var_dump($cars);
?>
</pre>

Example 6

Result View Example

Document

Document in project

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Reference