IteratorAggregate Arayüzü

    (PHP 5, PHP 7, PHP 8)

    Giriş

    Harici bir yineleyici oluşturmak için arayüz.

    Arayüz Sözdizimi

    interface IteratorAggregate extends Traversable {
    /* Yöntemler */
    public getIterator(): Traversable
    }

    Örnekler

    Örnek 1 - Temel kullanımı

    <?php

    class Verilerim implements IteratorAggregate
    {
    public     $özellik1 = "Birinci genel özellik";
    public     $özellik2 = "İkinci genel özellik";
    public     $özellik3 = "Üçüncü genel özellik";
    public     $özellik4 = "";

    public function     __construct()
    {
    $this->özellik4 = "son özellik";
    }

    /* PHP, tr_TR yerelinde bu yöntemi de arıyor, yoksa
    * "Fatal error: Couldn't find implementation for method
    * Verilerim::getiterator in Unknown on line 0"
    * hatasını veriyor.
    */
    public function getiterator()
    {
    return new     ArrayIterator($this);
    }

    public public function     getIterator(): Traversable
    {
    return new     ArrayIterator($this);
    }
    }

    $obj = new Verilerim();

    foreach (    $obj as $key => $value) {
    var_dump($key, $value);
    echo     "\n";
    }

    ?>

    Yukarıdaki örnek şuna benzer bir çıktı üretir:

    string(9) "özellik1"
string(22) "Birinci genel özellik"

string(9) "özellik2"
string(22) "İkinci genel özellik"

string(9) "özellik3"
string(25) "Üçüncü genel özellik"

string(9) "özellik4"
string(12) "son özellik"

    İçindekiler

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    User Contributed Notes 4 notes

    up
    29
    trumbull dot j at gmail dot com
    8 years ago
    It might seem obvious, but you can return a compiled generator from your IteratorAggregate::getIterator() implementation.<?phpclass Collection implements IteratorAggregate{    private $items = [];    public function __construct($items = [])    {        $this->items = $items;    }    public function getIterator()    {        return (function () {            while(list($key, $val) = each($this->items)) {                yield $key => $val;            }        })();    }}$data = [ 'A', 'B', 'C', 'D' ];$collection = new Collection($data);foreach ($collection as $key => $val) {    echo sprintf("[%s] => %s\n", $key, $val);}?>
    up
    22
    Tab Atkins
    13 years ago
    Note that, at least as of 5.3, you still aren't allowed to return a normal Array from getIterator().In some places, the docs wrap the array into an ArrayObject and return that.  DON'T DO IT.  ArrayObject drops any empty-string keys on the floor when you iterate over it (again, at least as of 5.3).Use ArrayIterator instead.  I wouldn't be surprised if it didn't have its own set of wonderful bugs, but at the very least it works correctly when you use it with this method.
    up
    11
    Martin Speer
    6 years ago
    You can use yield from in getIterator in recent PHP 7 versions: <?php class Example implements \IteratorAggregate{  protected $data = [];  public function __construct(array $data)   {    $this->data = $data;  }  public function getIterator()   {    yield from $this->data;  }}$test = new Example([1, 2, 3]);foreach ($test as $node) {  echo $test, PHP_EOL;}/* * Outputs: * * 1 * 2 * 3  */ ?>
    up
    15
    Lubaev.K
    12 years ago
    <?php// IteratorAggregate// Create indexed and associative arrays.class myData implements IteratorAggregate {    private $array = [];    const TYPE_INDEXED = 1;    const TYPE_ASSOCIATIVE = 2;    public function __construct( array $data, $type = self::TYPE_INDEXED ) {        reset($data);        while( list($k, $v) = each($data) ) {            $type == self::TYPE_INDEXED ?            $this->array[] = $v :            $this->array[$k] = $v;        }    }    public function getIterator() {        return new ArrayIterator($this->array);    }}$obj = new myData(['one'=>'php','javascript','three'=>'c#','java',], /*TYPE 1 or 2*/ );foreach($obj as $key => $value) {    var_dump($key, $value);    echo PHP_EOL;}// if TYPE == 1#int(0)#string(3) "php"#int(1)#string(10) "javascript"#int(2)#string(2) "c#"#int(3)#string(4) "java"// if TYPE == 2#string(3) "one"#string(3) "php"#int(0)#string(10) "javascript"#string(5) "three"#string(2) "c#"#int(1)#string(4) "java"?>Good luck!
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