# The FilterIterator class

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

## Introduction

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

## Class synopsis

abstract class FilterIterator extends IteratorIterator {
/* Methods */
public function __construct(Iterator `$iterator`)
public function accept(): bool
public function current(): mixed
public function key(): mixed
public function next(): void
public function rewind(): void
public function valid(): bool
/* Inherited methods */
public function IteratorIterator::current(): mixed
public function IteratorIterator::getInnerIterator(): ?Iterator
public function IteratorIterator::key(): mixed
public function IteratorIterator::next(): void
public function IteratorIterator::rewind(): void
public function IteratorIterator::valid(): bool
}

## Table of Contents

- FilterIterator::accept — Check whether the current element of the iterator is acceptable
- FilterIterator::__construct — Construct a filterIterator
- FilterIterator::current — Get the current element value
- FilterIterator::key — Get the current key
- FilterIterator::next — Move the iterator forward
- FilterIterator::rewind — Rewind the iterator
- FilterIterator::valid — Check whether the current element is valid

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