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The RecursiveFilterIterator class

(PHP 5 >= 5.1.0)

简介

This abstract iterator filters out unwanted values for a RecursiveIterator. This class should be extended to implement custom filters. The RecursiveFilterIterator::accept() must be implemented in the subclass.

类摘要

RecursiveFilterIterator extends FilterIterator implements Iterator , Traversable , OuterIterator , RecursiveIterator {
/* 方法 */
public __construct ( RecursiveIterator $iterator )
public void getChildren ( void )
public void hasChildren ( void )
/* 继承的方法 */
abstract bool FilterIterator::accept ( void )
FilterIterator::__construct ( Iterator $iterator )
mixed FilterIterator::current ( void )
Iterator FilterIterator::getInnerIterator ( void )
mixed FilterIterator::key ( void )
void FilterIterator::next ( void )
void FilterIterator::rewind ( void )
bool FilterIterator::valid ( void )
}

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PHP手册 - N: The RecursiveFilterIterator class

用户评论:

lemats (05-May-2011 06:14)

Recursive directory/file listing, filteres ".svn":

<?php

class MyRecursiveFilterIterator extends RecursiveFilterIterator {

    public static $FILTERS = array(
        '.svn',
    );

    public function accept() {
        return !in_array(
            $this->current()->getFilename(),
            self::$FILTERS,
            true
        );
    }

}

$dirItr    = new RecursiveDirectoryIterator('/sample/path');
$filterItr = new MyRecursiveFilterIterator($dirItr);
$itr       = new RecursiveIteratorIterator($filterItr, RecursiveIteratorIterator::SELF_FIRST);
foreach ($itr as $filePath => $fileInfo) {
    echo $fileInfo->getFilename() . PHP_EOL;
}

?>

Russell Dias (28-Sep-2010 02:38)

I had to create a filter to get values greater than a certain number in a multidimensional array.

Hope someone else finds it helpful:

<?php
class GreaterThanFilter extends RecursiveFilterIterator {
    protected $limit;

    public function __construct(RecursiveIterator $recursiveIter, $limit) {
        $this->limit = $limit;
        parent::__construct($recursiveIter);
    }
    public function accept() {
        return $this->hasChildren() || strlen($this->current()) >= $this->limit;
    }
     public function getChildren() {
        return new self($this->getInnerIterator()->getChildren(), $this->limit);
    }
}
$iter = new RecursiveArrayIterator($array);
$filter   = new GreaterThanFilter($iter, 5);

foreach(new RecursiveIteratorIterator($filter) as $key => $value)
{
    echo $value . "\n";
}
?>