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Open Source Technologies

Notes key even within the same declaration. The value itself can be of any PHP type, including an array.
Arrays containing arrays give a similar result as multi-dimensional arrays in other languages.
Here are a few examples:

array(1, 2, 3) is the same as the more explicit array(0 => 1, 1 => 2, 2 ‘=> 3).

array(“name” => “John”, “age” => 28)
array(1 => “ONE”, “TWO”, “THREE”) is equivalent to array(1 => “ONE”, 2 =>

→“TWO”, 3 => “THREE”).
array() an empty array.

Here’s an example of a nested array() statement:

array(array(“name” => “John”, “age” => 28), array(“name” =>
→“Barbara”, “age” => 67))

The previous example demonstrates an array with two elements: Each one is a collection (array)
of a person’s information.
Accessing Array Elements: Array elements can be accessed by using the $arr[key] notation,
where key is either an integer or string expression. When using a constant string for key, make
sure you don’t forget the single or double quotes, such as $arr[“key”]. This notation can be used
for both reading array elements and modifying or creating new elements.
Modifying/Creating Array Elements

$arr1 = array(1, 2, 3);
$arr2[0] = 1;

$arr2[1] = 2;

$arr2[2] = 3;
print_r($arr1);

print_r($arr2);
The print_r() function has not been covered yet in this book, but when it is passed an array, it
prints out the array’s contents in a readable way. You can use this function when debugging
your scripts.

The previous example prints
Array

(
[0] => 1

Gutmans_ch02 Page 24 Thursday, September 23, 2004 2:37 PM

[1] => 2

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