(PHP 5 >= 5.1.0)
RecursiveFilterIterator::__construct — Create a RecursiveFilterIterator from a RecursiveIterator
Create a RecursiveFilterIterator from a RecursiveIterator.
No value is returned.
Example #1 Basic RecursiveFilterIterator() example
<?php
class TestsOnlyFilter extends RecursiveFilterIterator {
    public function accept() {
        // Accept the current item if we can recurse into it
        // or it is a value starting with "test"
        return $this->hasChildren() || (strpos($this->current(), "test") !== FALSE);
    }
}
$array    = array("test1", array("taste2", "test3", "test4"), "test5");
$iterator = new RecursiveArrayIterator($array);
$filter   = new TestsOnlyFilter($iterator);
foreach(new RecursiveIteratorIterator($filter) as $key => $value)
{
    echo $value . "\n";
}
?>
The above example will output something similar to:
test1 test3 test4 test5
Example #2 RecursiveFilterIterator() example
<?php
class StartsWithFilter extends RecursiveFilterIterator {
    protected $word;
    public function __construct(RecursiveIterator $rit, $word) {
        $this->word = $word;
        parent::__construct($rit);
    }
    public function accept() {
        return $this->hasChildren() OR strpos($this->current(), $this->word) === 0;
    }
    
    public function getChildren() {
        return new self($this->getInnerIterator()->getChildren(), $this->word);
    }
}
$array    = array("test1", array("taste2", "test3", "test4"), "test5");
$iterator = new RecursiveArrayIterator($array);
$filter   = new StartsWithFilter($iterator, "test");
foreach(new RecursiveIteratorIterator($filter) as $key => $value)
{
    echo $value . "\n";
}
?>
The above example will output something similar to:
test1 test3 test4 test5