Create a RecursiveFilterIterator from a RecursiveIterator

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- RecursiveFilterIterator
- Create a RecursiveFilterIterator from a RecursiveIterator

# RecursiveFilterIterator::__construct

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

RecursiveFilterIterator::__construct — Create a RecursiveFilterIterator from a RecursiveIterator

### Description

public RecursiveFilterIterator::__construct(RecursiveIterator `$iterator`)

Create a RecursiveFilterIterator from a RecursiveIterator.

### Parameters

`iterator`

  The RecursiveIterator to be filtered.

### Examples

Example #1 Basic RecursiveFilterIterator() example

    <?phpclass 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

    <?phpclass 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

### See Also

- RecursiveFilterIterator::getChildren() - Return the inner iterator's children contained in a RecursiveFilterIterator
- RecursiveFilterIterator::hasChildren() - Check whether the inner iterator's current element has children
- FilterIterator::accept() - Check whether the current element of the iterator is acceptable