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<?php
/**
* This file is part of the ramsey/collection library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Collection;
use ArrayIterator;
use Traversable;
use function serialize;
use function unserialize;
/**
* This class provides a basic implementation of `ArrayInterface`, to minimize
* the effort required to implement this interface.
*/
abstract class AbstractArray implements ArrayInterface
{
/**
* The items of this array.
*
* @var mixed[]
*/
protected $data = [];
/**
* Constructs a new array object.
*
* @param mixed[] $data The initial items to add to this array.
*/
public function __construct(array $data = [])
{
// Invoke offsetSet() for each value added; in this way, sub-classes
// may provide additional logic about values added to the array object.
foreach ($data as $key => $value) {
$this[$key] = $value;
}
}
/**
* Returns an iterator for this array.
*
* @link http://php.net/manual/en/iteratoraggregate.getiterator.php IteratorAggregate::getIterator()
*
* @return ArrayIterator<mixed, mixed>
*/
public function getIterator(): Traversable
{
return new ArrayIterator($this->data);
}
/**
* Returns `true` if the given offset exists in this array.
*
* @link http://php.net/manual/en/arrayaccess.offsetexists.php ArrayAccess::offsetExists()
*
* @param mixed $offset The offset to check.
*/
public function offsetExists($offset): bool
{
return isset($this->data[$offset]);
}
/**
* Returns the value at the specified offset.
*
* @link http://php.net/manual/en/arrayaccess.offsetget.php ArrayAccess::offsetGet()
*
* @param mixed $offset The offset for which a value should be returned.
*
* @return mixed|null the value stored at the offset, or null if the offset
* does not exist.
*/
public function offsetGet($offset)
{
return $this->data[$offset] ?? null;
}
/**
* Sets the given value to the given offset in the array.
*
* @link http://php.net/manual/en/arrayaccess.offsetset.php ArrayAccess::offsetSet()
*
* @param mixed|null $offset The offset to set. If `null`, the value may be
* set at a numerically-indexed offset.
* @param mixed $value The value to set at the given offset.
*/
public function offsetSet($offset, $value): void
{
if ($offset === null) {
$this->data[] = $value;
} else {
$this->data[$offset] = $value;
}
}
/**
* Removes the given offset and its value from the array.
*
* @link http://php.net/manual/en/arrayaccess.offsetunset.php ArrayAccess::offsetUnset()
*
* @param mixed $offset The offset to remove from the array.
*/
public function offsetUnset($offset): void
{
unset($this->data[$offset]);
}
/**
* Returns a serialized string representation of this array object.
*
* @link http://php.net/manual/en/serializable.serialize.php Serializable::serialize()
*
* @return string a PHP serialized string.
*/
public function serialize(): string
{
return serialize($this->data);
}
/**
* Converts a serialized string representation into an instance object.
*
* @link http://php.net/manual/en/serializable.unserialize.php Serializable::unserialize()
*
* @param string $serialized A PHP serialized string to unserialize.
*
* @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
*/
public function unserialize($serialized): void
{
$this->data = unserialize($serialized, ['allowed_classes' => false]);
}
/**
* Returns the number of items in this array.
*
* @link http://php.net/manual/en/countable.count.php Countable::count()
*/
public function count(): int
{
return count($this->data);
}
/**
* Removes all items from this array.
*/
public function clear(): void
{
$this->data = [];
}
/**
* Returns a native PHP array representation of this array object.
*
* @return mixed[]
*/
public function toArray(): array
{
return $this->data;
}
/**
* Returns `true` if this array is empty.
*/
public function isEmpty(): bool
{
return count($this->data) === 0;
}
}
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