PHP 8.1.0 RC 2 available for testing

The ParentIterator class

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

简介

This extended FilterIterator allows a recursive iteration using RecursiveIteratorIterator that only shows those elements which have children.

类摘要

class ParentIterator extends RecursiveFilterIterator implements RecursiveIterator, OuterIterator {
/* 方法 */
public __construct(RecursiveIterator $iterator)
public accept(): bool
public hasChildren(): bool
public next(): void
public rewind(): void
/* 继承的方法 */
}

目录

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User Contributed Notes 2 notes

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4
Anonymous
9 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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2
dn dot permyakov at gmail dot com
2 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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