PHP (Core & Framework)

Multidimensional Arrays in PHP

arrays-php

Technical definition :A multidimensional array is an array containing one or more arrays.

PHP supports multidimensional arrays that are two, three, four, five, or more levels deep. However, arrays more than three levels deep are hard to manage for most people so use of multidimensional array up to two levels is more common.

You must be familiar with the use of single dimension array like echo $name[$i] , here we need just one index $i to access array element.

The dimension of an array indicates the number of indices you need to select an element.

  • For a two-dimensional array you need two indices to access an element
  • For a three-dimensional array you need three indices to access an element

PHP – Two-dimensional Arrays

A two-dimensional array is an array of arrays (a three-dimensional array is an array of arrays of arrays).

First, take a look at the following table:

Name Stock Sold
Volvo 22 18
BMW 15 13
Saab 5 2
Land Rover 17 15

We can store the data from the table above in a two-dimensional array, like this:

$cars = array
(
array(“Volvo”,22,18),
array(“BMW”,15,13),
array(“Saab”,5,2),
array(“Land Rover”,17,15)
);

Now the two-dimensional $cars array contains four arrays, and it has two indices: row and column.

To get access to the elements of the $cars array we must point to the two indices (row and column):

<?php
echo $cars[0][0].“: In stock: “.$cars[0][1].“, sold: “.$cars[0][2].“.<br>”;
echo $cars[1][0].“: In stock: “.$cars[1][1].“, sold: “.$cars[1][2].“.<br>”;
echo $cars[2][0].“: In stock: “.$cars[2][1].“, sold: “.$cars[2][2].“.<br>”;
echo $cars[3][0].“: In stock: “.$cars[3][1].“, sold: “.$cars[3][2].“.<br>”;
?>

We can also put a for loop inside another for loop to get the elements of the $cars array (we still have to point to the two indices):

<?php
for ($row = 0; $row < 4; $row++) {
echo “<p><b>Row number $row</b></p>”;
echo “<ul>”;
for ($col = 0; $col < 3; $col++) {
echo “<li>”.$cars[$row][$col].“</li>”;
}
echo “</ul>”;
}
?>

you can find details on w3schools.com

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