Dowry system
Saturday, July 7, 2018
Friday, May 4, 2018
PHP 5 Multidimensional Arrays
PHP
5 Multidimensional
Arrays
However,
sometimes you want to store values with more than one key.
This can be
stored in multidimensional arrays.
PHP
- Multidimensional Arrays
A
multidimensional array is an array containing one or more arrays.
PHP understands
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).
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):
Example
<?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 $cars array
(we still have to point to the two indices):
Example
<?php
for
($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>";
}
?>
