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

    Содержание

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    Примечания пользователей 2 notes

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    3
    dn dot permyakov at gmail dot com
    5 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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    3
    Anonymous
    13 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);
    ?>
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