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php-basics/src/InterfaceTraits/IteratorTrait.php

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<?php
/**
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* PHP Basics
*
* Copyright (C) 2024 Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
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*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
declare(strict_types=1);
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namespace OCC\Basics\InterfaceTraits;
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use Iterator;
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/**
* A generic implementation of the Iterator interface.
*
* @author Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
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* @package Basics\InterfaceTraits
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*
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* @template TKey of int|string
* @template TValue of mixed
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* @template TData of array<TKey, TValue>
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* @implements Iterator<TKey, TValue>
* @phpstan-require-implements Iterator
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*/
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trait IteratorTrait
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{
/**
* Holds the iterable data.
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*
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* @var TData
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*/
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protected array $data = [];
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/**
* Return the current item.
*
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* @return TValue|false The current item or FALSE if invalid
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*/
public function current(): mixed
{
return current($this->data);
}
/**
* Return the current key.
*
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* @return ?TKey The current key or NULL if invalid
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*/
public function key(): mixed
{
return key($this->data);
}
/**
* Move forward to next item.
*
* @return void
*/
public function next(): void
{
next($this->data);
}
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/**
* Move back to previous item.
*
* @return void
*/
public function prev(): void
{
prev($this->data);
}
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/**
* Rewind the iterator to the first item.
*
* @return void
*/
public function rewind(): void
{
reset($this->data);
}
/**
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* Check if current position is valid.
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*
* @return bool Whether the current position is valid
*/
public function valid(): bool
{
return !is_null($this->key());
}
}