RecursiveFilterIterator::__construct

(PHP 5 >= 5.1.0, PHP 7)

Create a RecursiveFilterIterator from a RecursiveIterator

public RecursiveFilterIterator::__construct ( RecursiveIterator $iterator )

Create a RecursiveFilterIterator from a RecursiveIterator.

Parameters:

iterator

The RecursiveIterator to be filtered.

Returns:

No value is returned.

Examples:

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

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