L'interface IteratorAggregate

(PHP 5 >= 5.0.0)

Introduction

Interface pour créer un itérateur externe.

Sommaire de l'Interface

IteratorAggregate extends Traversable {

/* Méthodes */

abstract public Traversable getIterator ( void )

}

Exemple #1 Exemple simple


<?php
class myData implements IteratorAggregate {
    public $property1 = "Propriété publique numéro un";
    public $property2 = "Propriété publique numéro deux";
    public $property3 = "Propriété publique numéro trois";

    public function __construct() {
        $this->property4 = "dernière propriété";
    }

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

$obj = new myData;

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

L'exemple ci-dessus va afficher quelque chose de similaire à :

string(9) "property1"
string(19) "Propriété publique numéro un"

string(9) "property2"
string(19) "Propriété publique numéro deux"

string(9) "property3"
string(21) "Propriété publique numéro trois"

string(9) "property4"
string(13) "dernière propriété"

Sommaire

IteratorAggregate::getIterator — Retourne un itérateur externe

add a note User Contributed Notes IteratorAggregate - [2 notes]

down

Lubaev.K ¶

3 days 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!

down

Tab Atkins ¶

1 year 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.

add a note