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Editing: Headers.php

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<?php
/**
 * Slim - a micro PHP 5 framework
 *
 * @author      Josh Lockhart <info@slimframework.com>
 * @copyright   2011 Josh Lockhart
 * @link        http://www.slimframework.com
 * @license     http://www.slimframework.com/license
 * @version     2.4.2
 * @package     Slim
 *
 * MIT LICENSE
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
namespace Slim\Http;

/**
  * HTTP Headers
  *
  * @package Slim
  * @author  Josh Lockhart
  * @since   1.6.0
  */
class Headers extends \Slim\Helper\Set
{
    /********************************************************************************
    * Static interface
    *******************************************************************************/

/**
     * Special-case HTTP headers that are otherwise unidentifiable as HTTP headers.
     * Typically, HTTP headers in the $_SERVER array will be prefixed with
     * `HTTP_` or `X_`. These are not so we list them here for later reference.
     *
     * @var array
     */
    protected static $special = array(
        'CONTENT_TYPE',
        'CONTENT_LENGTH',
        'PHP_AUTH_USER',
        'PHP_AUTH_PW',
        'PHP_AUTH_DIGEST',
        'AUTH_TYPE'
    );

/**
     * Extract HTTP headers from an array of data (e.g. $_SERVER)
     * @param  array $data
     * @return array
     */
    public static function extract($data)
    {
        $results = array();
        foreach ($data as $key => $value) {
            $key = strtoupper($key);
            if (strpos($key, 'X_') === 0 || strpos($key, 'HTTP_') === 0 || in_array($key, static::$special)) {
                if ($key === 'HTTP_CONTENT_LENGTH') {
                    continue;
                }
                $results[$key] = $value;
            }
        }

return $results;
    }

/********************************************************************************
    * Instance interface
    *******************************************************************************/

/**
     * Transform header name into canonical form
     * @param  string $key
     * @return string
     */
    protected function normalizeKey($key)
    {
        $key = strtolower($key);
        $key = str_replace(array('-', '_'), ' ', $key);
        $key = preg_replace('#^http #', '', $key);
        $key = ucwords($key);
        $key = str_replace(' ', '-', $key);

return $key;
    }
}

Editing: Headers.php

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