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   1  <?php
   2  
   3  namespace Httpful\Response;
   4  
   5  final class Headers implements \ArrayAccess, \Countable {
   6  
   7      private $headers;
   8  
   9      private function __construct($headers)
  10      {
  11          $this->headers = $headers;
  12      }
  13  
  14      public static function fromString($string)
  15      {
  16          $lines = preg_split("/(\r|\n)+/", $string, -1, PREG_SPLIT_NO_EMPTY);
  17          array_shift($lines); // HTTP HEADER
  18          $headers = array();
  19          foreach ($lines as $line) {
  20              list($name, $value) = explode(':', $line, 2);
  21              $headers[strtolower(trim($name))] = trim($value);
  22          }
  23          return new self($headers);
  24      }
  25  
  26      public function offsetExists($offset)
  27      {
  28          return isset($this->headers[strtolower($offset)]);
  29      }
  30  
  31      public function offsetGet($offset)
  32      {
  33          if (isset($this->headers[$name = strtolower($offset)])) {
  34              return $this->headers[$name];
  35          }
  36      }
  37  
  38      public function offsetSet($offset, $value)
  39      {
  40          throw new \Exception("Headers are read-only.");
  41      }
  42  
  43      public function offsetUnset($offset)
  44      {
  45          throw new \Exception("Headers are read-only.");
  46      }
  47  
  48      public function count()
  49      {
  50          return count($this->headers);
  51      }
  52  
  53      public function toArray()
  54      {
  55          return $this->headers;
  56      }
  57  
  58  }