# 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 __construct(Iterator `$iterator`)
public accept(): bool
public current(): mixed
public key(): mixed
public next(): void
public rewind(): void
public valid(): bool
/* Inherited methods */
public IteratorIterator::current(): mixed
public IteratorIterator::getInnerIterator(): ?Iterator
public IteratorIterator::key(): mixed
public IteratorIterator::next(): void
public IteratorIterator::rewind(): void
public 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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