4 * This file is part of the Symfony package.
6 * (c) Fabien Potencier <fabien@symfony.com>
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
12 namespace Symfony\Component\HttpFoundation;
15 * HeaderBag is a container for HTTP headers.
17 * @author Fabien Potencier <fabien@symfony.com>
19 class HeaderBag implements \IteratorAggregate, \Countable
21 protected $headers = array();
22 protected $cacheControl = array();
25 * @param array $headers An array of HTTP headers
27 public function __construct(array $headers = array())
29 foreach ($headers as $key => $values) {
30 $this->set($key, $values);
35 * Returns the headers as a string.
37 * @return string The headers
39 public function __toString()
41 if (!$headers = $this->all()) {
46 $max = max(array_map('strlen', array_keys($headers))) + 1;
48 foreach ($headers as $name => $values) {
49 $name = implode('-', array_map('ucfirst', explode('-', $name)));
50 foreach ($values as $value) {
51 $content .= sprintf("%-{$max}s %s\r\n", $name.':', $value);
59 * Returns the headers.
61 * @return array An array of headers
65 return $this->headers;
69 * Returns the parameter keys.
71 * @return array An array of parameter keys
73 public function keys()
75 return array_keys($this->all());
79 * Replaces the current HTTP headers by a new set.
81 * @param array $headers An array of HTTP headers
83 public function replace(array $headers = array())
85 $this->headers = array();
90 * Adds new headers the current HTTP headers set.
92 * @param array $headers An array of HTTP headers
94 public function add(array $headers)
96 foreach ($headers as $key => $values) {
97 $this->set($key, $values);
102 * Returns a header value by name.
104 * @param string $key The header name
105 * @param string|string[] $default The default value
106 * @param bool $first Whether to return the first value or all header values
108 * @return string|string[] The first header value or default value if $first is true, an array of values otherwise
110 public function get($key, $default = null, $first = true)
112 $key = str_replace('_', '-', strtolower($key));
113 $headers = $this->all();
115 if (!array_key_exists($key, $headers)) {
116 if (null === $default) {
117 return $first ? null : array();
120 return $first ? $default : array($default);
124 return \count($headers[$key]) ? $headers[$key][0] : $default;
127 return $headers[$key];
131 * Sets a header by name.
133 * @param string $key The key
134 * @param string|string[] $values The value or an array of values
135 * @param bool $replace Whether to replace the actual value or not (true by default)
137 public function set($key, $values, $replace = true)
139 $key = str_replace('_', '-', strtolower($key));
141 if (\is_array($values)) {
142 $values = array_values($values);
144 if (true === $replace || !isset($this->headers[$key])) {
145 $this->headers[$key] = $values;
147 $this->headers[$key] = array_merge($this->headers[$key], $values);
150 if (true === $replace || !isset($this->headers[$key])) {
151 $this->headers[$key] = array($values);
153 $this->headers[$key][] = $values;
157 if ('cache-control' === $key) {
158 $this->cacheControl = $this->parseCacheControl(implode(', ', $this->headers[$key]));
163 * Returns true if the HTTP header is defined.
165 * @param string $key The HTTP header
167 * @return bool true if the parameter exists, false otherwise
169 public function has($key)
171 return array_key_exists(str_replace('_', '-', strtolower($key)), $this->all());
175 * Returns true if the given HTTP header contains the given value.
177 * @param string $key The HTTP header name
178 * @param string $value The HTTP value
180 * @return bool true if the value is contained in the header, false otherwise
182 public function contains($key, $value)
184 return in_array($value, $this->get($key, null, false));
190 * @param string $key The HTTP header name
192 public function remove($key)
194 $key = str_replace('_', '-', strtolower($key));
196 unset($this->headers[$key]);
198 if ('cache-control' === $key) {
199 $this->cacheControl = array();
204 * Returns the HTTP header value converted to a date.
206 * @param string $key The parameter key
207 * @param \DateTime $default The default value
209 * @return null|\DateTime The parsed DateTime or the default value if the header does not exist
211 * @throws \RuntimeException When the HTTP header is not parseable
213 public function getDate($key, \DateTime $default = null)
215 if (null === $value = $this->get($key)) {
219 if (false === $date = \DateTime::createFromFormat(DATE_RFC2822, $value)) {
220 throw new \RuntimeException(sprintf('The %s HTTP header is not parseable (%s).', $key, $value));
227 * Adds a custom Cache-Control directive.
229 * @param string $key The Cache-Control directive name
230 * @param mixed $value The Cache-Control directive value
232 public function addCacheControlDirective($key, $value = true)
234 $this->cacheControl[$key] = $value;
236 $this->set('Cache-Control', $this->getCacheControlHeader());
240 * Returns true if the Cache-Control directive is defined.
242 * @param string $key The Cache-Control directive
244 * @return bool true if the directive exists, false otherwise
246 public function hasCacheControlDirective($key)
248 return array_key_exists($key, $this->cacheControl);
252 * Returns a Cache-Control directive value by name.
254 * @param string $key The directive name
256 * @return mixed|null The directive value if defined, null otherwise
258 public function getCacheControlDirective($key)
260 return array_key_exists($key, $this->cacheControl) ? $this->cacheControl[$key] : null;
264 * Removes a Cache-Control directive.
266 * @param string $key The Cache-Control directive
268 public function removeCacheControlDirective($key)
270 unset($this->cacheControl[$key]);
272 $this->set('Cache-Control', $this->getCacheControlHeader());
276 * Returns an iterator for headers.
278 * @return \ArrayIterator An \ArrayIterator instance
280 public function getIterator()
282 return new \ArrayIterator($this->headers);
286 * Returns the number of headers.
288 * @return int The number of headers
290 public function count()
292 return count($this->headers);
295 protected function getCacheControlHeader()
298 ksort($this->cacheControl);
299 foreach ($this->cacheControl as $key => $value) {
300 if (true === $value) {
303 if (preg_match('#[^a-zA-Z0-9._-]#', $value)) {
304 $value = '"'.$value.'"';
307 $parts[] = "$key=$value";
311 return implode(', ', $parts);
315 * Parses a Cache-Control HTTP header.
317 * @param string $header The value of the Cache-Control HTTP header
319 * @return array An array representing the attribute values
321 protected function parseCacheControl($header)
323 $cacheControl = array();
324 preg_match_all('#([a-zA-Z][a-zA-Z_-]*)\s*(?:=(?:"([^"]*)"|([^ \t",;]*)))?#', $header, $matches, PREG_SET_ORDER);
325 foreach ($matches as $match) {
326 $cacheControl[strtolower($match[1])] = isset($match[3]) ? $match[3] : (isset($match[2]) ? $match[2] : true);
329 return $cacheControl;