EDIT

    '#title' => t('Geoservice Bounding Box'),

    '#description' => t('Define the surrounding area using latitude and longitude. Leave as is for the whole world.')

/**

 * Truncates a $string to the specified $length. 

 * If the supplied string is equal to or shorter than the $legth the original is returend.

 * if an $appendix is defined the resulting string will have the specified $length including the $appendix.

 *

 * @param String $string	the string to truncate

 * @param Number $length	the maximun length

 * @param String $appendix	an optional appendix.

 *

 * @return the string

 */

function str_trunk(&$string, $length, $appendix=''){

  if(strlen($string) >= $length ){

    return  substr($string, 0, $length - strlen($appendix)).$appendix;

  } else {

    return $string;

  }

}

/**

 * @param string $str

 * @param string $sub

 * @return boolean

 */

function str_beginsWith( $str, $sub ) {

  return ( substr( $str, 0, strlen( $sub ) ) === $sub );

}

/**

 *

 * @param string $str

 * @param string $sub

 * @return boolean

 */

function str_endsWith( $str, $sub ) {

  return ( substr( $str, strlen( $str ) - strlen( $sub ) ) === $sub );

}

/**

 * Replaces all occurences in $array of the key defined in $replace_map with the according values in the 

 * $replace_map.

 * 

 * @param $array

 * @param $replace_map 

 * @return unknown_type

 */

function array_replace_key($array, $replace_map){

  foreach($replace_map as $key=>$newkey){

    if(isset($array[$key])){

      $array[$newkey] = $array[$key];

      unset($array[$key]);

    }

  }

  return $array;

}

/**

 * Replaces all occurrences of space characters with 

 * an underscore and transforms the given

 * string to lowercase.

 *

 * @param String $string

 * @return the transformed string

 */

function generalizeString($string){

  return str_replace(' ', '_', strtolower($string));

}