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        $this->internalArray = array();30    }31 32    /**33     * @return int34     */35    #[\ReturnTypeWillChange]36    public function count()37    {38        return count($this->internalArray);39    }40 41    /**42     * @return array43     */44    public function toArray()45    {46        ksort($this->internalArray);47        return (array) $this->internalArray;48    }49 50    /**51     * @param array $array52     * @param bool $save_indexes53     * @return SplFixedArray54     * @psalm-suppress MixedAssignment55     */56    public static function fromArray(array $array, $save_indexes = true)57    {58        $self = new SplFixedArray(count($array));59        if($save_indexes) {60            foreach($array as $key => $value) {61                $self[(int) $key] = $value;62            }63        } else {64            $i = 0;65            foreach (array_values($array) as $value) {66                $self[$i] = $value;67                $i++;68            }69        }70        return $self;71    }72 73    /**74     * @return int75     */76    #[\ReturnTypeWillChange]77    public function getSize()78    {79        return $this->size;80    }81 82    /**83     * @param int $size84     * @return bool85     */86    #[\ReturnTypeWillChange]87    public function setSize($size)88    {89        $this->size = $size;90        return true;91    }92 93    /**