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    The ArrayObject class

    (PHP 5, PHP 7, PHP 8)

    简介

    This class allows objects to work as arrays.

    注意: Wrapping objects with this class is fundamentally flawed, and therefore its usage with objects is discouraged.

    类摘要

    class ArrayObject implements IteratorAggregate, ArrayAccess, Serializable, Countable {
    /* 常量 */
    public const int STD_PROP_LIST;
    public const int ARRAY_AS_PROPS;
    /* 方法 */
    public __construct(array|object $array = [], int $flags = 0, string $iteratorClass = ArrayIterator::class)
    public append(mixed $value): void
    public asort(int $flags = SORT_REGULAR): true
    public count(): int
    public exchangeArray(array|object $array): array
    public getArrayCopy(): array
    public getFlags(): int
    public getIterator(): Iterator
    public getIteratorClass(): string
    public ksort(int $flags = SORT_REGULAR): true
    public natcasesort(): true
    public natsort(): true
    public offsetExists(mixed $key): bool
    public offsetGet(mixed $key): mixed
    public offsetSet(mixed $key, mixed $value): void
    public offsetUnset(mixed $key): void
    public serialize(): string
    public setFlags(int $flags): void
    public setIteratorClass(string $iteratorClass): void
    public uasort(callable $callback): true
    public uksort(callable $callback): true
    public unserialize(string $data): void
    }

    预定义常量

    ArrayObject Flags

    ArrayObject::STD_PROP_LIST

    Properties of the object have their normal functionality when accessed as list (var_dump(), foreach, etc.).

    ArrayObject::ARRAY_AS_PROPS

    Entries can be accessed as properties (read and write). The ArrayObject class uses its own logic to access properties, thus no warning or error is raised when trying to read or write dynamic properties.

    目录

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    用户贡献的备注 10 notes

    up
    98
    php5 dot man at lightning dot hu
    12 years ago
    As you know ArrayObject is not an array so you can't use the built in array functions. Here's a trick around that:

    Extend the ArrayObject class with your own and implement this magic method:

    <?php
    public function __call($func, $argv)
    {
    if (!    is_callable($func) || substr($func, 0, 6) !== 'array_')
    {
    throw new     BadMethodCallException(__CLASS__.'->'.$func);
    }
    return     call_user_func_array($func, array_merge(array($this->getArrayCopy()), $argv));
    }
    ?>

    Now you can do this with any array_* function:
    <?php
    $yourObject    ->array_keys();
    ?>
    - Don't forget to ommit the first parameter - it's automatic!

    Note: You might want to write your own functions if you're working with large sets of data.
    up
    33
    rwn dot gallego at gmail dot com
    11 years ago
    There is a better explanation about the ArrayObject flags (STD_PROP_LIST and ARRAY_AS_PROPS) right here:

    http://stackoverflow.com/a/16619183/1019305

    Thanks to JayTaph
    up
    11
    bub at gmail dot com
    2 years ago
    If you need the last key of your collection use:
    <?php
    array_key_last    ($this->getArrayCopy())
    ?>

    In an extending class it could look like:
    <?php
    class Collection extends ArrayObject
    {
    public function     lastKey(): int
    {
    return     array_key_last($this->getArrayCopy());
    }
    }
    ?>

    If you want to use any type safe collection:
    <?php
    class BookCollection extends Collection
    {
    public function     add(Book $book) : void
    {
    $this->offsetSet($book->id, $book);
    }

    // note the return type "Book"
    public function get(int $bookId) : Book
    {
    $this->offsetGet($bookId);
    }
    }
    ?>
    up
    24
    MarkAndrewSlade at gmail dot com
    13 years ago
    I found the description of STD_PROP_LIST a bit vague, so I put together a simple demonstration to show its behavior:

    <?php

    $a     = new ArrayObject(array(), ArrayObject::STD_PROP_LIST);
    $a['arr'] = 'array data';
    $a->prop = 'prop data';
    $b = new ArrayObject();
    $b['arr'] = 'array data';
    $b->prop = 'prop data';

    // ArrayObject Object
    // (
    // [prop] => prop data
    // )
    print_r($a);

    // ArrayObject Object
    // (
    // [arr] => array data
    // )
    print_r($b);

    ?>
    up
    10
    deminy at deminy dot net
    15 years ago
    Generally variable $this can't be used as an array within an object context. For example, following code piece would cause a fatal error:

    <?php
    class TestThis {
    public function     __set($name, $val) {
    $this[$name] = $val;
    }

    public function     __get($name) {
    return     $this[$name];
    }
    }

    $obj = new TestThis();
    $obj->a = 'aaa';
    echo     $obj->a . "\n";
    ?>

    But things are different when $this is used in an ArrayObject object. e.g., following code piece are valid:

    <?php
    class TestArrayObject extends ArrayObject {
    public function     __set($name, $val) {
    $this[$name] = $val;
    }

    public function     __get($name) {
    return     $this[$name];
    }
    }

    $obj = new TestArrayObject();
    $obj->a = 'aaa';
    echo     $obj->a . "\n";
    ?>
    up
    9
    Gilles A
    10 years ago
    // Example STD_PROP_LIST and ARRAY_AS_PROP combined
    <?php
    $ao     = new ArrayObject();
    $ao ->setFlags(ArrayObject::STD_PROP_LIST|ArrayObject::ARRAY_AS_PROPS);

    $ao->prop = 'prop data';
    $ao['arr'] = 'array data';

    print_r($ao);

    ?>

    // Result

    ArrayObject Object
    (
    [storage:ArrayObject:private] =&gt; Array
    (
    [prop] => prop data
    [arr] => array data
    )

    )
    up
    3
    hello at rayfung dot hk
    3 years ago
    If you want to use built-in array function with ArrayObject, store the iterator instance and return the value as reference in offsetGet.

    <?php
    class Collection extends \ArrayObject {
    public function     __construct(array $data = [])
    {
    if (!    \is_array($data) && !\array_key_exists('ArrayAccess', class_implements($data))) {
    $data = [$data];
    }

    $this->iterator = $this->getIterator();
    parent::__construct($data);
    }

    public function &    offsetGet($index)
    {
    $value = &$this->iterator[$index] ?? null;

    return     $value;
    }
    }
    ?>
    up
    3
    Vuong Nguyen
    6 years ago
    You can easily realise that ArrayObject can use various functions as they are in ArrayIterator to iterate an object-as-a-array. However, you need to "activate" these function (rewind, valid, next and so on...) by using getIterator() first. Actually this function inherits from Iterator Aggregate interface.

    Take a look at the following basic example. The results are the same:

    <?php

    $array     = [1, 2, 3, 4];
    $a = new ArrayObject($array);
    $b = new ArrayIterator($array);

    $iterator = $a->getIterator();

    for(    $iterator->rewind(); $iterator->valid(); $iterator->next()){
    echo     $iterator->current()*2;

    }

    for(    $b->rewind(); $b->valid(); $b->next()){
    echo     $b->current()*2;

    }

    //Resulst are the same 2468 AND 2468
    up
    6
    sfinktah at php dot spamtrak dot org
    13 years ago
    If you plan to derive your own class from ArrayObject, and wish to maintain complete ArrayObject functionality (such as being able to cast to an array), it is necessary to use ArrayObject's own private property "storage".

    Since that is impossible to do directly, you must use ArrayObject's offset{Set,Get,Exists,Unset} methods to manipulate it indirectly.

    As a side benefit, this means you inherit all the iteration and other functions in complete working order.

    This may sound obvious to someone who has never implemented their own ArrayObject class... but it is far from so.

    <?php

    class MyArrayObject extends ArrayObject {
    static     $debugLevel = 2;

    static public function     sdprintf() {
    if (static::    $debugLevel > 1) {
    call_user_func_array("printf", func_get_args());
    }
    }

    public function     offsetGet($name) {
    self::sdprintf("%s(%s)\n", __FUNCTION__, implode(",", func_get_args()));
    return     call_user_func_array(array(parent, __FUNCTION__), func_get_args());
    }
    public function     offsetSet($name, $value) {
    self::sdprintf("%s(%s)\n", __FUNCTION__, implode(",", func_get_args()));
    return     call_user_func_array(array(parent, __FUNCTION__), func_get_args());
    }
    public function     offsetExists($name) {
    self::sdprintf("%s(%s)\n", __FUNCTION__, implode(",", func_get_args()));
    return     call_user_func_array(array(parent, __FUNCTION__), func_get_args());
    }
    public function     offsetUnset($name) {
    self::sdprintf("%s(%s)\n", __FUNCTION__, implode(",", func_get_args()));
    return     call_user_func_array(array(parent, __FUNCTION__), func_get_args());
    }
    }

    $mao = new MyArrayObject();
    $mao["name"] = "bob";
    $mao["friend"] = "jane";
    print_r((array)$mao);

    /* Output:

    offsetSet(name,bob)
    offsetSet(friend,jane)
    Array
    (
    [name] => bob
    [friend] => jane
    ) */
    ?>

    If you wish to use the "Array as Properties" flag, you simply need to include this in your constructor:

    <?php parent::setFlags(parent::ARRAY_AS_PROPS); ?>

    This will allow you to do things such as the below example, without overriding __get or __set .

    <?php
    $mao    ->name = "Phil";
    echo     $mao["name"]; /* Outputs "Phil" */
    ?>
    up
    3
    rudie
    6 years ago
    If you want numerical ArrayObject objects to play nice with json_encode(), implement JsonSerializable:

    class JsonSerializableArrayObject extends ArrayObject implements JsonSerializable {
    function jsonSerialize() {
    return $this->getArrayCopy();
    }
    }

    For assoc ArrayObject objects this isn't neccesary, but for numerical arrays it is, otherwise they will be formatted like

    {"0":"jaap","1":"karel"}

    instead of

    ["jaap","karel"]
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