1: <?php
 2: 
 3: namespace Httpful\Response;
 4: 
 5: final class Headers implements \ArrayAccess, \Countable {
 6: 
 7:     private $headers;
 8: 
 9:     /**
10:      * @param array $headers
11:      */
12:     private function __construct($headers)
13:     {
14:         $this->headers = $headers;
15:     }
16: 
17:     /**
18:      * @param string $string
19:      * @return Headers
20:      */
21:     public static function fromString($string)
22:     {
23:         $lines = preg_split("/(\r|\n)+/", $string, -1, PREG_SPLIT_NO_EMPTY);
24:         array_shift($lines); // HTTP HEADER
25:         $headers = array();
26:         foreach ($lines as $line) {
27:             list($name, $value) = explode(':', $line, 2);
28:             $headers[strtolower(trim($name))] = trim($value);
29:         }
30:         return new self($headers);
31:     }
32: 
33:     /**
34:      * @param string $offset
35:      * @return bool
36:      */
37:     public function offsetExists($offset)
38:     {
39:         return isset($this->headers[strtolower($offset)]);
40:     }
41: 
42:     /**
43:      * @param string $offset
44:      * @return mixed
45:      */
46:     public function offsetGet($offset)
47:     {
48:         if (isset($this->headers[$name = strtolower($offset)])) {
49:             return $this->headers[$name];
50:         }
51:     }
52: 
53:     /**
54:      * @param string $offset
55:      * @param string $value
56:      * @throws \Exception
57:      */
58:     public function offsetSet($offset, $value)
59:     {
60:         throw new \Exception("Headers are read-only.");
61:     }
62: 
63:     /**
64:      * @param string $offset
65:      * @throws \Exception
66:      */
67:     public function offsetUnset($offset)
68:     {
69:         throw new \Exception("Headers are read-only.");
70:     }
71: 
72:     /**
73:      * @return int
74:      */
75:     public function count()
76:     {
77:         return count($this->headers);
78:     }
79: 
80:     /**
81:      * @return array
82:      */
83:     public function toArray()
84:     {
85:         return $this->headers;
86:     }
87: 
88: }