Класс ParentIterator

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

    Введение

    Это расширенный класс от FilterIterator, позволяющий осуществить рекурсивную итерацию, используя класс RecursiveIteratorIterator, который показывает только те элементы, которые имеют потомков.

    Обзор класса

    class ParentIterator extends RecursiveFilterIterator {
    /* Методы */
    public function __construct(RecursiveIterator $iterator)
    public function accept(): bool
    public function getChildren(): ParentIterator
    public function hasChildren(): bool
    public function next(): void
    public function rewind(): void
    /* Наследуемые методы */
    public function RecursiveFilterIterator::getChildren(): ?RecursiveFilterIterator
    public function RecursiveFilterIterator::hasChildren(): bool
    public function FilterIterator::accept(): bool
    public function FilterIterator::current(): mixed
    public function FilterIterator::key(): mixed
    public function FilterIterator::next(): void
    public function FilterIterator::rewind(): void
    public function FilterIterator::valid(): bool
    public function IteratorIterator::current(): mixed
    public function IteratorIterator::getInnerIterator(): ?Iterator
    public function IteratorIterator::key(): mixed
    public function IteratorIterator::next(): void
    public function IteratorIterator::rewind(): void
    public function IteratorIterator::valid(): bool
    }

    Содержание

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    Примечания пользователей 2 notes

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    4
    Anonymous
    14 years ago
    ParentIterator is just a RecursiveFilterIterator whos accept() method calls the RecursiveFilterIterator->hasChildren() method to filter itself.

Basically, it filters out leaf nodes. For example

This would yield all files and directories
<?php
$rdi = new RecursiveDirectoryIterator(__DIR__);
$iter = new RecursiveIteratorIterator($rdi, RecursiveIteratorIterator::CHILD_FIRST);
?>

wrapping that in a ParentIterator would filter it down to just directories
<?php
$rdi = new RecursiveDirectoryIterator(__DIR__);
$iter = new RecursiveIteratorIterator($rdi, RecursiveIteratorIterator::CHILD_FIRST);
$dirsOnly = new ParentIterator($iter);
?>
    up
    3
    dn dot permyakov at gmail dot com
    7 years ago
    Easy example for understanding:
<?php

$iterator = new ParentIterator(
    new RecursiveArrayIterator(
        array(array(1, 2, 3), 'A', 'B', 'C')
    )
);

foreach ($iterator as $recursive) {
    foreach ($recursive as $value) {
        echo $value . PHP_EOL;
    }
}
?>

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