PHP 8.5.0 RC 2 available for testing

    La classe LimitIterator

    (PHP 5 >= 5.1.0, PHP 7, PHP 8)

    Introduction

    La classe LimitIterator permet d'itérer sur une partie limitée d'entités depuis un Iterator.

    Synopsis de la classe

    class LimitIterator extends IteratorIterator {
    /* Méthodes */
    public __construct(Iterator $iterator, int $offset = 0, int $limit = -1)
    public current(): mixed
    public getPosition(): int
    public key(): mixed
    public next(): void
    public rewind(): void
    public seek(int $offset): int
    public valid(): bool
    /* Méthodes héritées */
    public IteratorIterator::current(): mixed
    public IteratorIterator::getInnerIterator(): ?Iterator
    public IteratorIterator::key(): mixed
    public IteratorIterator::next(): void
    public IteratorIterator::rewind(): void
    public IteratorIterator::valid(): bool
    }

    Exemples

    Exemple #1 Exemple d'utilisation de LimitIterator

    <?php

    // Creér un itérateur à limiter
    $fruits = new ArrayIterator(array(
    'apple',
    'banana',
    'cherry',
    'damson',
    'elderberry'
    ));

    // Boucle sur les 3 premiers fruits uniquement
    foreach (new LimitIterator($fruits, 0, 3) as $fruit) {
    var_dump($fruit);
    }

    echo     "\n";

    // Boucle depuis le 3ème fruit jusqu'au dernier
    // Note: la clé démarre à zéro pour apple
    foreach (new LimitIterator($fruits, 2) as $fruit) {
    var_dump($fruit);
    }

    ?>

    L'exemple ci-dessus va afficher :

    string(5) "apple"
string(6) "banana"
string(6) "cherry"

string(6) "cherry"
string(6) "damson"
string(10) "elderberry"

    Sommaire

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 2 notes

    up
    1
    christophg at grenz-bonn dot de
    4 years ago
    If the inner iterator implements SeekableIterator, LimitIterator uses seek() after rewind() to move to the offset.
    up
    0
    woody dot gilk at gmail dot com
    11 hours ago
    Note that the keys are NOT altered by LimitIterator, so:

    $items = new LimitIterator([0 => 'foo', 1 => 'bar', 2 => 'baz'], 1, 1);

    // $items is effectively [1 => 'bar']
    ＋add a note
    To Top