ArrayObject
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ArrayObject::__construct

(PHP 5 >= 5.0.0)

ArrayObject::__construct — Construct a new array object

说明

public ArrayObject::__construct() ([ mixed $input [, int $flags [, string $iterator_class ]]] )

This constructs a new array object.

参数

input

The input parameter accepts an array or an Object.

flags

Flags to control the behaviour of the ArrayObject object.

iterator_class

Specify the class that will be used for iteration of the ArrayObject object. ArrayIterator is the default class used.

返回值

没有返回值。

范例

Example #1 ArrayObject::__construct() example

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

$arrayobject = new ArrayObject($array);

var_dump($arrayobject);
?>

以上例程会输出：

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

参见

ArrayObject
在线手册：中文 英文
PHP手册
PHP手册 - N: Construct a new array object

用户评论:

ashley at nospam dot zincdigital dot com (03-Jul-2009 11:18)

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.

kjarli at gmail dot com (03-Jul-2008 11:11)

This extend allows multidimensional arrays to be converted aswell. It also returns 'Array' when echoed (unlike ArrayObject which gives an error).
<?php
/**
 * @author iltar van der berg
 * @version 1.0.1
 */
class RecursiveArrayObject extends ArrayObject
{
    /**
     * overwrites the ArrayObject constructor for
     * iteration through the "array". When the item
     * is an array, it creates another self() instead
     * of an array
     *
     * @param Array $array data array
     */
    public function __construct(Array $array)
    {   
        foreach($array as $key => $value) {
            if(is_array($value)){
                $value = new self($value);
            }
            $this->offsetSet($key, $value);
        }
    }
   
    /**
     * returns Array when printed (like "echo array();")
     * instead of an error
     *
     * @return string
     */
    public function __ToString()
    {
        return 'Array';
    }
}
?>

german dot rumm at gmail dot com (14-Mar-2008 06:37)

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
    }
?>

agalkin at agalkin dot ru (21-Aug-2007 09:56)

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
?>

Grigori Kochanov (15-Jul-2006 11:51)

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