SplFixedArray

14class SplFixedArray implements Iterator, ArrayAccess, Countable15{16    /** @var array<int, mixed> */17    private $internalArray = array();18 19    /** @var int $size */20    private $size = 0;21 22    /**23     * SplFixedArray constructor.24     * @param int $size25     */26    public function __construct($size = 0)27    {28        $this->size = $size;29        $this->internalArray = array();30    }31 32    /**33     * @return int34     */35    public function count()36    {37        return count($this->internalArray);38    }39 40    /**41     * @return array42     */43    public function toArray()44    {45        ksort($this->internalArray);46        return (array) $this->internalArray;47    }48 49    /**50     * @param array $array51     * @param bool $save_indexes52     * @return SplFixedArray53     * @psalm-suppress MixedAssignment54     */55    public static function fromArray(array $array, $save_indexes = true)56    {57        $self = new SplFixedArray(count($array));58        if($save_indexes) {59            foreach($array as $key => $value) {60                $self[(int) $key] = $value;61            }62        } else {63            $i = 0;64            foreach (array_values($array) as $value) {65                $self[$i] = $value;66                $i++;67            }68        }69        return $self;70    }71 72    /**73     * @return int74     */75    public function getSize()76    {77        return $this->size;78    }79 80    /**81     * @param int $size82     * @return bool83     */84    public function setSize($size)85    {86        $this->size = $size;87        return true;88    }89 90    /**91     * @param string|int $index92     * @return bool93     */