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   1  <?php
   2  
   3  /**
   4   * URL constants as defined in the PHP Manual under "Constants usable with
   5   * http_build_url()".
   6   *
   7   * @see http://us2.php.net/manual/en/http.constants.php#http.constants.url
   8   */
   9  if (!defined('HTTP_URL_REPLACE')) {
  10      define('HTTP_URL_REPLACE', 1);
  11  }
  12  if (!defined('HTTP_URL_JOIN_PATH')) {
  13      define('HTTP_URL_JOIN_PATH', 2);
  14  }
  15  if (!defined('HTTP_URL_JOIN_QUERY')) {
  16      define('HTTP_URL_JOIN_QUERY', 4);
  17  }
  18  if (!defined('HTTP_URL_STRIP_USER')) {
  19      define('HTTP_URL_STRIP_USER', 8);
  20  }
  21  if (!defined('HTTP_URL_STRIP_PASS')) {
  22      define('HTTP_URL_STRIP_PASS', 16);
  23  }
  24  if (!defined('HTTP_URL_STRIP_AUTH')) {
  25      define('HTTP_URL_STRIP_AUTH', 32);
  26  }
  27  if (!defined('HTTP_URL_STRIP_PORT')) {
  28      define('HTTP_URL_STRIP_PORT', 64);
  29  }
  30  if (!defined('HTTP_URL_STRIP_PATH')) {
  31      define('HTTP_URL_STRIP_PATH', 128);
  32  }
  33  if (!defined('HTTP_URL_STRIP_QUERY')) {
  34      define('HTTP_URL_STRIP_QUERY', 256);
  35  }
  36  if (!defined('HTTP_URL_STRIP_FRAGMENT')) {
  37      define('HTTP_URL_STRIP_FRAGMENT', 512);
  38  }
  39  if (!defined('HTTP_URL_STRIP_ALL')) {
  40      define('HTTP_URL_STRIP_ALL', 1024);
  41  }
  42  
  43  if (!function_exists('http_build_url')) {
  44  
  45      /**
  46       * Build a URL.
  47       *
  48       * The parts of the second URL will be merged into the first according to
  49       * the flags argument.
  50       *
  51       * @param mixed $url     (part(s) of) an URL in form of a string or
  52       *                       associative array like parse_url() returns
  53       * @param mixed $parts   same as the first argument
  54       * @param int   $flags   a bitmask of binary or'ed HTTP_URL constants;
  55       *                       HTTP_URL_REPLACE is the default
  56       * @param array $new_url if set, it will be filled with the parts of the
  57       *                       composed url like parse_url() would return
  58       * @return string
  59       */
  60  	function http_build_url($url, $parts = array(), $flags = HTTP_URL_REPLACE, &$new_url = array())
  61      {
  62          is_array($url) || $url = parse_url($url);
  63          is_array($parts) || $parts = parse_url($parts);
  64  
  65          isset($url['query']) && is_string($url['query']) || $url['query'] = null;
  66          isset($parts['query']) && is_string($parts['query']) || $parts['query'] = null;
  67  
  68          $keys = array('user', 'pass', 'port', 'path', 'query', 'fragment');
  69  
  70          // HTTP_URL_STRIP_ALL and HTTP_URL_STRIP_AUTH cover several other flags.
  71          if ($flags & HTTP_URL_STRIP_ALL) {
  72              $flags |= HTTP_URL_STRIP_USER | HTTP_URL_STRIP_PASS
  73                  | HTTP_URL_STRIP_PORT | HTTP_URL_STRIP_PATH
  74                  | HTTP_URL_STRIP_QUERY | HTTP_URL_STRIP_FRAGMENT;
  75          } elseif ($flags & HTTP_URL_STRIP_AUTH) {
  76              $flags |= HTTP_URL_STRIP_USER | HTTP_URL_STRIP_PASS;
  77          }
  78  
  79          // Schema and host are alwasy replaced
  80          foreach (array('scheme', 'host') as $part) {
  81              if (isset($parts[$part])) {
  82                  $url[$part] = $parts[$part];
  83              }
  84          }
  85  
  86          if ($flags & HTTP_URL_REPLACE) {
  87              foreach ($keys as $key) {
  88                  if (isset($parts[$key])) {
  89                      $url[$key] = $parts[$key];
  90                  }
  91              }
  92          } else {
  93              if (isset($parts['path']) && ($flags & HTTP_URL_JOIN_PATH)) {
  94                  if (isset($url['path']) && substr($parts['path'], 0, 1) !== '/') {
  95                      // Workaround for trailing slashes
  96                      $url['path'] .= 'a';
  97                      $url['path'] = rtrim(
  98                              str_replace(basename($url['path']), '', $url['path']),
  99                              '/'
 100                          ) . '/' . ltrim($parts['path'], '/');
 101                  } else {
 102                      $url['path'] = $parts['path'];
 103                  }
 104              }
 105  
 106              if (isset($parts['query']) && ($flags & HTTP_URL_JOIN_QUERY)) {
 107                  if (isset($url['query'])) {
 108                      parse_str($url['query'], $url_query);
 109                      parse_str($parts['query'], $parts_query);
 110  
 111                      $url['query'] = http_build_query(
 112                          array_replace_recursive(
 113                              $url_query,
 114                              $parts_query
 115                          )
 116                      );
 117                  } else {
 118                      $url['query'] = $parts['query'];
 119                  }
 120              }
 121          }
 122  
 123          if (isset($url['path']) && $url['path'] !== '' && substr($url['path'], 0, 1) !== '/') {
 124              $url['path'] = '/' . $url['path'];
 125          }
 126  
 127          foreach ($keys as $key) {
 128              $strip = 'HTTP_URL_STRIP_' . strtoupper($key);
 129              if ($flags & constant($strip)) {
 130                  unset($url[$key]);
 131              }
 132          }
 133  
 134          $parsed_string = '';
 135  
 136          if (!empty($url['scheme'])) {
 137              $parsed_string .= $url['scheme'] . '://';
 138          }
 139  
 140          if (!empty($url['user'])) {
 141              $parsed_string .= $url['user'];
 142  
 143              if (isset($url['pass'])) {
 144                  $parsed_string .= ':' . $url['pass'];
 145              }
 146  
 147              $parsed_string .= '@';
 148          }
 149  
 150          if (!empty($url['host'])) {
 151              $parsed_string .= $url['host'];
 152          }
 153  
 154          if (!empty($url['port'])) {
 155              $parsed_string .= ':' . $url['port'];
 156          }
 157  
 158          if (!empty($url['path'])) {
 159              $parsed_string .= $url['path'];
 160          }
 161  
 162          if (!empty($url['query'])) {
 163              $parsed_string .= '?' . $url['query'];
 164          }
 165  
 166          if (!empty($url['fragment'])) {
 167              $parsed_string .= '#' . $url['fragment'];
 168          }
 169  
 170          $new_url = $url;
 171  
 172          return $parsed_string;
 173      }
 174  }