PHP Multidimensional Arrays

A multidimensional array in PHP is a data structure that allows you to store data in a nested structure, like a table with rows and columns, or even more than two dimensions.

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.

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 select an element
For a three-dimensional array you need three indices to select 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).

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):

Example

<!DOCTYPE html>
<html>
<body>

<?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].".
";
echo $cars[1][0].": In stock: ".$cars[1][1].", sold: ".$cars[1][2].".
";
echo $cars[2][0].": In stock: ".$cars[2][1].", sold: ".$cars[2][2].".
";
echo $cars[3][0].": In stock: ".$cars[3][1].", sold: ".$cars[3][2].".
";
?>

</body>
</html>

Output

Volvo: In stock: 22, sold: 18.
BMW: In stock: 15, sold: 13.
Saab: In stock: 5, sold: 2.
Land Rover: In stock: 17, sold: 15.

Here are the PHP logical operators to use in if statements:

Operator	Name	Result
and	And	True if both conditions are true
&&	And	True if both conditions are true
or	Or	True if either condition is true
\|\|	Or	True if either condition is true
xor	Xor	True if either condition is true, but not both
!	Not	True if condition is not true