PHP 7.4.0 alpha 3 Released

The ParentIterator class

(PHP 5 >= 5.1.0, PHP 7)

Einführung

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

Klassenbeschreibung

ParentIterator extends RecursiveFilterIterator implements RecursiveIterator , OuterIterator {
/* Methoden */
public accept ( void ) : bool
public __construct ( RecursiveIterator $iterator )
public getChildren ( void ) : ParentIterator
public hasChildren ( void ) : bool
public next ( void ) : void
public rewind ( void ) : void
/* Geerbte Methoden */
}

Inhaltsverzeichnis

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User Contributed Notes 2 notes

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4
Anonymous
7 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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0
dn dot permyakov at gmail dot com
2 months 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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