Remove space fullsize and halfsize

/**
* Remove space fullsize
*
* @param string $str string before remove
* @return string after removed
*/
public static function mb_trim($str, $chars = '\s　') {
    $str = preg_replace("/^[$chars]+/u", '', $str);
    $str = preg_replace("/[$chars]+$/u", '', $str);
    return $str;
}

or

/**
* Trim space, tab
* @param string $value
* @return string
*/
public function trimSpace($value) {
    mb_internal_encoding('UTF-8');
    mb_regex_encoding('UTF-8');
    $value = mb_ereg_replace("^[\n\r\s\t　]+", '', $value);
    $value = mb_ereg_replace("[\n\r\s\t　]+$", '', $value);
    $value = trim($value);
    return $value;
}