去除php注释和去除空格函数分享

虽然php5中已有php_strip_whitespace方法可以返回删除注释和空格后的php源码的功能，为了学习，这里为大家提供一个自己的方法，也可以去除代码中的空白和注释，代码如下：

/**
 * 去除代码中的空白和注释
 * @param string $content 代码内容
 * @return string
 */
function strip_whitespace($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 .= "<<<think\n";
                    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;
}