PHP 7.0.6 Released

    The ParentIterator class

    (PHP 5 >= 5.1.0, PHP 7)

    Introduction

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

    Class synopsis

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

    Table of Contents

    User Contributed Notes

    Anonymous
    4 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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