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ArrayObject::__construct

(PHP 5, PHP 7, PHP 8)

ArrayObject::__constructConstruct a new array object

Description

public ArrayObject::__construct(array|object $array = [], int $flags = 0, string $iteratorClass = ArrayIterator::class)

This constructs a new array object.

Parameters

array

The array parameter accepts an array or an Object.

flags

Flags to control the behaviour of the ArrayObject object. See ArrayObject::setFlags().

iteratorClass

Specify the class that will be used for iteration of the ArrayObject object. The class must implement ArrayIterator.

Examples

Example #1 ArrayObject::__construct() example

<?php
$array
= array('1' => 'one',
'2' => 'two',
'3' => 'three');

$arrayobject = new ArrayObject($array);

var_dump($arrayobject);
?>

The above example will output:

object(ArrayObject)#1 (3) {
  [1]=>
  string(3) "one"
  [2]=>
  string(3) "two"
  [3]=>
  string(5) "three"
}

See Also

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User Contributed Notes 4 notes

up
-1
ashley at nospam dot zincdigital dot com
14 years ago
The great confusion with this class is in its naming. ArrayObject infers it will behave as an Array and as an Object. It won't. It behaves as an array. It would better be called ArrayType. You can, with some work, get it to work both as an object and as an array, but that is up to you.
up
-1
german dot rumm at gmail dot com
16 years ago
BTW, if you need to change array later, use exchangeArray() method. Good to know when you are writing a class that extends ArrayObject()

AFAIK, exchangeArray() doesn't return anything.

<?php
$a
= array('one', 'two', 'three');
$ao = new ArrayObject($a);

foreach (
$ao as $element) {
echo
$element . ' '; // one two three
}

$b = array('four', 'five', 'six');
$ao->exchangeArray($b); // returns null

foreach ($ao as $element) {
echo
$element . ' '; // four five six
}
?>
up
-3
Grigori Kochanov
17 years ago
As Marcus explained, the flag ArrayObject::SPL_ARRAY_AS_PROPS means the array element may be used as a property if there is no conflict with visible properties.

If there are visible properties in the class, the array element will not overwrite it's value.

<?php
class Rules extends ArrayObject {
public
$len = 1;
function
__construct($array){
parent::__construct($array,ArrayObject::ARRAY_AS_PROPS);
$this['len'] = 2;
}
}
$x = new Rules(array(1,2));
echo
$x->len;
?>
Result: 1

<?php
class Rules extends ArrayObject {
private
$len = 1;
function
__construct($array){
parent::__construct($array,ArrayObject::ARRAY_AS_PROPS);
$this['len'] = 2;
}
}
$x = new Rules(array(1,2));
echo
$x->len;
?>
Result: 2
up
-10
agalkin at agalkin dot ru
16 years ago
Note that the first argument to ArrayObject::__construct, the initial array, is passed by reference. Nevertheless, modification of the array doesn't modify the object, so it may cause unexpected behaviour.

<?php
$array
= array('foo' => 'initial');
$obj = new ArrayObject($array);

// array was passed by reference:
$obj['foo'] = 'modified';
var_dump($array); // foo => modified

// but it doesn't work backwards:
$array['foo'] = 'modified_again';
var_dump($obj); // foo => modified
var_dump($array); // foo => modified_again
?>
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