L'interface RecursiveIterator

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

Introduction

Les classes qui implémentent RecursiveIterator peut être utilisées pour itérer sur d'autres itérateurs récursivement.

Sommaire de l'Interface

interface RecursiveIterator extends Iterator {

/* Méthodes */

public getChildren(): ?RecursiveIterator

public hasChildren(): bool

/* Méthodes héritées */

public Iterator::current(): mixed

public Iterator::key(): mixed

public Iterator::next(): void

public Iterator::rewind(): void

public Iterator::valid(): bool

}

Sommaire

RecursiveIterator::getChildren — Récupère l'itérateur de l'entrée courante
RecursiveIterator::hasChildren — Vérifie si un itérateur peut être créé depuis l'entrée courante

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User Contributed Notes 2 notes

down

andresdzphp at php dot net ¶

13 years ago


RecursiveIterator example:

<?php

class MyRecursiveIterator implements RecursiveIterator
{
    private $_data;
    private $_position = 0;
    
    public function __construct(array $data) {
        $this->_data = $data;
    }
    
    public function valid() {
        return isset($this->_data[$this->_position]);
    }
    
    public function hasChildren() {
        return is_array($this->_data[$this->_position]);
    }
    
    public function next() {
        $this->_position++;
    }
    
    public function current() {
        return $this->_data[$this->_position];
    }
    
    public function getChildren() {
        echo '<pre>';
        print_r($this->_data[$this->_position]);
        echo '</pre>';
    }
    
    public function rewind() {
        $this->_position = 0;
    }
    
    public function key() {
        return $this->_position;
    }
}

$arr = array(0, 1, 2, 3, 4, 5 => array(10, 20, 30), 6, 7, 8, 9 => array(1, 2, 3));
$mri = new MyRecursiveIterator($arr);

foreach ($mri as $c => $v) {
    if ($mri->hasChildren()) {
        echo "$c has children: <br />";
        $mri->getChildren();
    } else {
        echo "$v <br />";
    }

}
?>

Result:

0 
1 
2 
3 
4 
5 has children: 
Array
(
    [0] => 10
    [1] => 20
    [2] => 30
)
6 
7 
8 
9 has children: 
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)

down

ksours at internbrands dot com ¶

8 years ago


Note that MyRecursiveIterator does not implement the correct return type for getChildren.  Which is why the example code doesn't make much sense.

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