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

    <?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

### 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