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ParentIterator クラス

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

はじめに

これは FilterIterator を継承したクラスで、 RecursiveIteratorIterator を使った再帰的な反復処理をできるようにします。ただし、子を持つ要素しか表示しません。

クラス概要

class ParentIterator extends RecursiveFilterIterator {

/* メソッド */

public __construct(RecursiveIterator $iterator)

public accept(): bool

public getChildren(): ParentIterator

public hasChildren(): bool

public next(): void

public rewind(): void

/* 継承したメソッド */

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

}

目次

ParentIterator::accept — 受け入れ可能かどうかを調べる
ParentIterator::__construct — ParentIterator を作成する
ParentIterator::getChildren — ParentIterator に含まれる内部イテレータの子を返す
ParentIterator::hasChildren — 内部イテレータの現在の要素が子を持つかどうかをチェックする
ParentIterator::next — イテレータを前に移動する
ParentIterator::rewind — イテレータを巻き戻す

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User Contributed Notes 2 notes

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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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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);
?>