Remove php comments and spaces function

/**
 * Remove blanks and comments in the code
 * @param string $content code content
 * @return string
*/
function strip_whitespace($content) {
    $stripStr   = '';
    //分析php源码
    $tokens     = token_get_all($content);
    $last_space = false;
    for ($i = 0, $j = count($tokens); $i < $j; $i++) {
        if (is_string($tokens[$i])) {
            $last_space = false;
            $stripStr  .= $tokens[$i];
        } else {
            switch ($tokens[$i][0]) {
                //过滤各种PHP注释
                case T_COMMENT:
                case T_DOC_COMMENT:
                    break;
                //过滤空格
                case T_WHITESPACE:
                    if (!$last_space) {
                        $stripStr  .= ' ';
                        $last_space = true;
                    }
                    break;
                case T_START_HEREDOC:
                    $stripStr .= "<<
                    break;
                case T_END_HEREDOC:
                    $stripStr .= "THINK;n";
                    for($k = $i+1; $k < $j; $k++) {
                        if(is_string($tokens[$k]) && $tokens[$k] == ';') {
                            $i = $k;
                            break;
                        } else if($tokens[$k][0] == T_CLOSE_TAG) {
                            break;
                        }
                    }
                    break;
                default:
                    $last_space = false;
                    $stripStr  .= $tokens[$i][1];
            }
        }
    }
    return $stripStr;
}