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[]; } 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', $this->getCacheControlHeader()); } /** * Returns an iterator for headers. * * @return \ArrayIterator> */ public function getIterator(): \ArrayIterator { return new \ArrayIterator($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); } }