<?php

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/**

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* Case-insensitive dictionary, suitable for HTTP headers

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*

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* @package Requests\Utilities

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*/

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namespace WpOrg\Requests\Utility;

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use ArrayAccess;

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use ArrayIterator;

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use IteratorAggregate;

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use ReturnTypeWillChange;

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use WpOrg\Requests\Exception;

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/**

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* Case-insensitive dictionary, suitable for HTTP headers

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*

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* @package Requests\Utilities

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*/

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class CaseInsensitiveDictionary implements ArrayAccess, IteratorAggregate {

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/**

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* Actual item data

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*

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* @var array

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*/

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protected $data = [];

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/**

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* Creates a case insensitive dictionary.

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*

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* @param array $data Dictionary/map to convert to case-insensitive

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*/

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public function __construct(array $data = []) {

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foreach ($data as $offset => $value) {

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$this->offsetSet($offset, $value);

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}

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}

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/**

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* Check if the given item exists

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*

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* @param string $offset Item key

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* @return boolean Does the item exist?

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*/

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#[ReturnTypeWillChange]

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public function offsetExists($offset) {

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if (is_string($offset)) {

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$offset = strtolower($offset);

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}

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return isset($this->data[$offset]);

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}

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/**

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* Get the value for the item

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*

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* @param string $offset Item key

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* @return string|null Item value (null if the item key doesn't exist)

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*/

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#[ReturnTypeWillChange]

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public function offsetGet($offset) {

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if (is_string($offset)) {

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$offset = strtolower($offset);

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}

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if (!isset($this->data[$offset])) {

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return null;

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}

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return $this->data[$offset];

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}

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/**

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* Set the given item

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*

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* @param string $offset Item name

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* @param string $value Item value

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*

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* @throws \WpOrg\Requests\Exception On attempting to use dictionary as list (`invalidset`)

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*/

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#[ReturnTypeWillChange]

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public function offsetSet($offset, $value) {

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if ($offset === null) {

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throw new Exception('Object is a dictionary, not a list', 'invalidset');

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}

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if (is_string($offset)) {

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$offset = strtolower($offset);

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}

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$this->data[$offset] = $value;

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}

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/**

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* Unset the given header

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*

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* @param string $offset The key for the item to unset.

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*/

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#[ReturnTypeWillChange]

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public function offsetUnset($offset) {

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if (is_string($offset)) {

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$offset = strtolower($offset);

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}

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unset($this->data[$offset]);

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}

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/**

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* Get an iterator for the data

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*

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* @return \ArrayIterator

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*/

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#[ReturnTypeWillChange]

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public function getIterator() {

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return new ArrayIterator($this->data);

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}

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/**

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* Get the headers as an array

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*

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* @return array Header data

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*/

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public function getAll() {

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return $this->data;

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}

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}

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