Page 120 - Open Soource Technologies 304.indd

Unit 7: Functions

Therefore, the previous example can be rewritten as follows: Notes
$arr1 = array(1, 2, 3);

$arr2[] = 1;

$arr2[] = 2;
$arr2[] = 3;

The result is the same as in the previous example.

The same holds true for arrays with string keys:
$arr1 = array(“name” => “Peter”, “age” => 28);

$arr2[“name”] = “Peter”;

$arr2[“age”] = 28;
if ($arr1 == $arr2) {

print ‘$arr1 and $arr2 are the same’ . “\n”;
}

The message confirming the equality of both arrays is printed.
7.8.4 Reading Array Values

You can use the $arr[key] notation to read array values. The next few examples build on top
of the previous example:

print $arr2[“name”];
if ($arr2[“age”] < 35) {

print “is quite young\n”;

This example prints
Peter is quite young

As previously mentioned, using the $arr[] syntax is not supported when
reading array indexes, but only when writing them.
7.8.5 Accessing Nested Arrays (or Multi-Dimensional Arrays)

When accessing nested arrays, you can just add as many square brackets as required to reach
the relevant value. The following is an example of how you can declare nested arrays:
$arr = array(1 => array(“name” => “Peter”, “age” => 28), array(“name”

| → => “Barbara”, “age” => 67))

You could achieve the same result with the following statements:
$arr[1][“name”] = “Peter”;

$arr[1][“age”] = 28;

LOVELY PROFESSIONAL UNIVERSITY 115