vendor/symfony/http-foundation/HeaderBag.php line 190
<?php/** This file is part of the Symfony package.** (c) Fabien Potencier <fabien@symfony.com>** For the full copyright and license information, please view the LICENSE* file that was distributed with this source code.*/namespace Symfony\Component\HttpFoundation;/*** HeaderBag is a container for HTTP headers.** @author Fabien Potencier <fabien@symfony.com>** @implements \IteratorAggregate<string, list<string|null>>*/class HeaderBag implements \IteratorAggregate, \Countable{protected const UPPER = '_ABCDEFGHIJKLMNOPQRSTUVWXYZ';protected const LOWER = '-abcdefghijklmnopqrstuvwxyz';/*** @var array<string, list<string|null>>*/protected $headers = [];protected $cacheControl = [];public function __construct(array $headers = []){foreach ($headers as $key => $values) {$this->set($key, $values);}}/*** Returns the headers as a string.*/public function __toString(): string{if (!$headers = $this->all()) {return '';}ksort($headers);$max = max(array_map('strlen', array_keys($headers))) + 1;$content = '';foreach ($headers as $name => $values) {$name = ucwords($name, '-');foreach ($values as $value) {$content .= sprintf("%-{$max}s %s\r\n", $name.':', $value);}}return $content;}/*** Returns the headers.** @param string|null $key The name of the headers to return or null to get them all** @return array<string, list<string|null>>|list<string|null>*/public function all(string $key = null): array{if (null !== $key) {return $this->headers[strtr($key, self::UPPER, self::LOWER)] ?? [];}return $this->headers;}/*** Returns the parameter keys.** @return string[]*/public function keys(): array{return array_keys($this->all());}/*** Replaces the current HTTP headers by a new set.*/public function replace(array $headers = []){$this->headers = [];$this->add($headers);}/*** Adds new headers the current HTTP headers set.*/public function add(array $headers){foreach ($headers as $key => $values) {$this->set($key, $values);}}/*** Returns the first header by name or the default one.*/public function get(string $key, string $default = null): ?string{$headers = $this->all($key);if (!$headers) {return $default;}if (null === $headers[0]) {return null;}return (string) $headers[0];}/*** Sets a header by name.** @param string|string[]|null $values The value or an array of values* @param bool $replace Whether to replace the actual value or not (true by default)*/public function set(string $key, string|array|null $values, bool $replace = true){$key = strtr($key, self::UPPER, self::LOWER);if (\is_array($values)) {$values = array_values($values);if (true === $replace || !isset($this->headers[$key])) {$this->headers[$key] = $values;} else {$this->headers[$key] = array_merge($this->headers[$key], $values);}} else {if (true === $replace || !isset($this->headers[$key])) {$this->headers[$key] = [$values];} else {$this->headers[$key][] = $values;}}if ('cache-control' === $key) {$this->cacheControl = $this->parseCacheControl(implode(', ', $this->headers[$key]));}}/*** Returns true if the HTTP header is defined.*/public function has(string $key): bool{return \array_key_exists(strtr($key, self::UPPER, self::LOWER), $this->all());}/*** Returns true if the given HTTP header contains the given value.*/public function contains(string $key, string $value): bool{return \in_array($value, $this->all($key));}/*** Removes a header.*/public function remove(string $key){$key = strtr($key, self::UPPER, self::LOWER);unset($this->headers[$key]);if ('cache-control' === $key) {$this->cacheControl = [];}}/*** Returns the HTTP header value converted to a date.** @throws \RuntimeException When the HTTP header is not parseable*/public function getDate(string $key, \DateTime $default = null): ?\DateTimeInterface{if (null === $value = $this->get($key)) {return $default;}if (false === $date = \DateTime::createFromFormat(\DATE_RFC2822, $value)) {throw new \RuntimeException(sprintf('The "%s" HTTP header is not parseable (%s).', $key, $value));}return $date;}/*** Adds a custom Cache-Control directive.*/public function addCacheControlDirective(string $key, bool|string $value = true){$this->cacheControl[$key] = $value;$this->set('Cache-Control', $this->getCacheControlHeader());}/*** Returns true if the Cache-Control directive is defined.*/public function hasCacheControlDirective(string $key): bool{return \array_key_exists($key, $this->cacheControl);}/*** Returns a Cache-Control directive value by name.*/public function getCacheControlDirective(string $key): bool|string|null{return $this->cacheControl[$key] ?? null;}/*** Removes a Cache-Control directive.*/public function removeCacheControlDirective(string $key){unset($this->cacheControl[$key]);$this->set('Cache-Control', $this->getCacheControlHeader());}/*** Returns an iterator for headers.** @return \ArrayIterator<string, list<string|null>>*/public function getIterator(): \ArrayIterator{return new \ArrayIterator($this->headers);}/*** Returns the number of headers.*/public function count(): int{return \count($this->headers);}protected function getCacheControlHeader(){ksort($this->cacheControl);return HeaderUtils::toString($this->cacheControl, ',');}/*** Parses a Cache-Control HTTP header.*/protected function parseCacheControl(string $header): array{$parts = HeaderUtils::split($header, ',=');return HeaderUtils::combine($parts);}}