<?php

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if (class_exists('SplFixedArray')) {

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return;

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}

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/**

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* The SplFixedArray class provides the main functionalities of array. The

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* main differences between a SplFixedArray and a normal PHP array is that

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* the SplFixedArray is of fixed length and allows only integers within

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* the range as indexes. The advantage is that it allows a faster array

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* implementation.

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*/

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class SplFixedArray implements Iterator, ArrayAccess, Countable

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{

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/** @var array<int, mixed> */

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private $internalArray = array();

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/** @var int $size */

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private $size = 0;

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/**

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* SplFixedArray constructor.

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* @param int $size

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*/

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public function __construct($size = 0)

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{

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$this->size = $size;

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$this->internalArray = array();

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}

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/**

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* @return int

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*/

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public function count()

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{

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return count($this->internalArray);

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}

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/**

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* @return array

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*/

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public function toArray()

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{

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ksort($this->internalArray);

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return (array) $this->internalArray;

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}

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/**

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* @param array $array

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* @param bool $save_indexes

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* @return SplFixedArray

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* @psalm-suppress MixedAssignment

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*/

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public static function fromArray(array $array, $save_indexes = true)

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{

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$self = new SplFixedArray(count($array));

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if($save_indexes) {

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foreach($array as $key => $value) {

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$self[(int) $key] = $value;

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}

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} else {

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$i = 0;

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foreach (array_values($array) as $value) {

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$self[$i] = $value;

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$i++;

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}

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}

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return $self;

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}

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/**

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* @return int

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*/

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public function getSize()

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{

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return $this->size;

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}

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/**

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* @param int $size

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* @return bool

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*/

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public function setSize($size)

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{

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$this->size = $size;

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return true;

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}

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/**

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* @param string|int $index

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* @return bool

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*/

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public function offsetExists($index)

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{

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return array_key_exists((int) $index, $this->internalArray);

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}

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/**

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* @param string|int $index

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* @return mixed

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*/

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public function offsetGet($index)

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{

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/** @psalm-suppress MixedReturnStatement */

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return $this->internalArray[(int) $index];

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}

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/**

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* @param string|int $index

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* @param mixed $newval

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* @psalm-suppress MixedAssignment

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*/

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public function offsetSet($index, $newval)

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{

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$this->internalArray[(int) $index] = $newval;

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}

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/**

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* @param string|int $index

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*/

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public function offsetUnset($index)

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{

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unset($this->internalArray[(int) $index]);

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}

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/**

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* Rewind iterator back to the start

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* @link https://php.net/manual/en/splfixedarray.rewind.php

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* @return void

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* @since 5.3.0

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*/

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public function rewind()

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{

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reset($this->internalArray);

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}

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/**

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* Return current array entry

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* @link https://php.net/manual/en/splfixedarray.current.php

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* @return mixed The current element value.

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* @since 5.3.0

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*/

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public function current()

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{

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/** @psalm-suppress MixedReturnStatement */

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return current($this->internalArray);

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}

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/**

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* Return current array index

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* @return int The current array index.

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*/

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public function key()

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{

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return key($this->internalArray);

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}

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/**

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* @return void

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*/

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public function next()

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{

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next($this->internalArray);

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}

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/**

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* Check whether the array contains more elements

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* @link https://php.net/manual/en/splfixedarray.valid.php

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* @return bool true if the array contains any more elements, false otherwise.

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*/

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public function valid()

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{

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if (empty($this->internalArray)) {

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return false;

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}

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$result = next($this->internalArray) !== false;

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prev($this->internalArray);

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return $result;

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}

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/**

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* Do nothing.

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*/

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public function __wakeup()

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{

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// NOP

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}

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}

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