45     public function hasHeader($header)  argument
47         return isset($this->headerNames[strtolower($header)]);
50     public function getHeader($header)  argument
52         $header = strtolower($header);
54         if (!isset($this->headerNames[$header])) {
58         $header = $this->headerNames[$header];
60         return $this->headers[$header];
63     public function getHeaderLine($header)  argument
65         return implode(', ', $this->getHeader($header));
68     public function withHeader($header, $value)  argument
70         $this->assertHeader($header);
72         $normalized = strtolower($header);
78         $new->headerNames[$normalized] = $header;
79         $new->headers[$header] = $value;
84     public function withAddedHeader($header, $value)  argument
86         $this->assertHeader($header);
88         $normalized = strtolower($header);
92             $header = $this->headerNames[$normalized];
93             $new->headers[$header] = array_merge($this->headers[$header], $value);
95             $new->headerNames[$normalized] = $header;
96             $new->headers[$header] = $value;
102     public function withoutHeader($header)  argument
104         $normalized = strtolower($header);
110         $header = $this->headerNames[$normalized];
113         unset($new->headers[$header], $new->headerNames[$normalized]);
141         foreach ($headers as $header => $value) {
142             if (is_int($header)) {
145                 $header = (string) $header;
147             $this->assertHeader($header);
149             $normalized = strtolower($header);
151                 $header = $this->headerNames[$normalized];
152                 $this->headers[$header] = array_merge($this->headers[$header], $value);
154                 $this->headerNames[$normalized] = $header;
155                 $this->headers[$header] = $value;
212      * @param mixed $header
216     private function assertHeader($header)  argument
218         if (!is_string($header)) {
221                 is_object($header) ? get_class($header) : gettype($header)
225         if ($header === '') {
229         if (! preg_match('/^[a-zA-Z0-9\'`#$%&*+.^_|~!-]+$/', $header)) {
233                     $header