original_string: public static function getModifiedSinceHeader()
      {
          $modifiedSince = '';
          if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
              $modifiedSince = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
  
              // strip any trailing data appended to header
              if (false !== ($semicolonPos = strpos($modifiedSince, ';'))) {
                  $modifiedSince = substr($modifiedSince, 0, $semicolonPos);
              }
          }
          return $modifiedSince;
      }
code: public static function getModifiedSinceHeader()
      {
          $modifiedSince = '';
          if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
              $modifiedSince = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
  
              // strip any trailing data appended to header
              if (false !== ($semicolonPos = strpos($modifiedSince, ';'))) {
                  $modifiedSince = substr($modifiedSince, 0, $semicolonPos);
              }
          }
          return $modifiedSince;
      }
code_tokens: public static function getModifiedSinceHeader ( ) { $ modifiedSince = '' ; if ( isset ( $ _SERVER [ 'HTTP_IF_MODIFIED_SINCE' ] ) ) { $ modifiedSince = $ _SERVER [ 'HTTP_IF_MODIFIED_SINCE' ] ; // strip any trailing data appended to header if ( false !== ( $ semicolonPos = strpos ( $ modifiedSince , ';' ) ) ) { $ modifiedSince = substr ( $ modifiedSince , 0 , $ semicolonPos ) ; } } return $ modifiedSince ; }
docstring: Returns the If-Modified-Since HTTP header if it can be found. If it cannot be
  found, an empty string is returned.
  
  @return string
docstring_tokens: Returns the If - Modified - Since HTTP header if it can be found . If it cannot be found an empty string is returned .