CascadiaPHP 2024

La clase ParentIterator

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

Introducción

Esta FilterIterator ampliada permite una iteración recursiva usando RecursiveIteratorIterator, que solamente muestra los elementos que tienen hijos.

Sinopsis de la Clase

Tabla de contenidos

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User Contributed Notes 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
12 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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