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Open Source Technologies

Notes $arr[2][“name”] = “Barbara”;
$arr[2][“age”] = 67;

Reading a nested array value is trivial using the same notation. For example, if you want to
print Peter’s age, the following statement does the trick:

print $arr[1][“age”];
7.8.6 Traversing Arrays Using Foreach

There are a few different ways of iterating over an array. The most elegant way is the foreach()
loop construct.

The general syntax of this loop is
foreach($array as [$key =>] [&] $value)

...
$key is optional, and when specified, it contains the currently iterated value’s key, which can
be either an integer or a string value, depending on the key’s type.

Specifying and for the value is also optional, and it has to be done if you are planning to modify
$value and want it to propagate to $array. In most cases, you won’t want to modify the $value
when iterating over an array and will, therefore, not need to specify it.

Here’s a short example of the foreach() loop:
$players = array(“Peter”, “Barbara”, “Bill”, “Nancy”);

print “The players are:\n”;
foreach ($players as $key => $value) {

print “#$key = $value\n”;
}

The output of this example is
The players are:

#0 = Peter
#1 = Barbara

#2 = Bill
#3 = Nancy

Here’s a more complicated example that iterates over an array of people and marks which
person is considered old and which one is considered young:

$people = array(1 => array(“name” => “Peter”, “age” => 28),
| →array(“name” => “Barbara”, “age” => 67));

foreach ($people as &$person) {
if ($person[“age”] >= 35) {

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