想给网站的地址换个cdn静态地址，但是找了半天WordPress插件都太复杂了，于是自己写了一个

在/wp-includes/functions.php文件末尾，加上

//hack for replace cdn site url
function replace_cdn_url_callback( $buffer ) {

        $blog_url = 'https://kimi.pub';
        $cnd_url = 'https://static.kimi.pub';

        $include_dirs[] = 'wp-content';
        $include_dirs[] = 'wp-includes';
        $include_dirs[] = 'download';

        $arr_dirs = array();
        foreach ( $include_dirs as $dir ) {
                $arr_dirs[] = preg_quote( trim( $dir ), '`' );
        }
        $dirs = implode( '|', $arr_dirs );

        $regex = '`(?<=[(\"\'])' . preg_quote( $blog_url, '`' ) . '/(?:((?:' . $dirs . ')[^\"\')]+)|([^/\"\']+\.[^/\"\')]+))(?=[\"\')])`';

        return preg_replace_callback( $regex, 'replace_cdn_url_rewriter', $buffer );
}

function replace_cdn_url_rewriter( $match ) {

        $blog_url = 'https://kimi.pub';
        $cnd_url = 'https://static.kimi.pub';

    if( count($match) == 2 ) {
        return str_replace( $blog_url, $cnd_url, $match[0]);
    } else {
        return $match[0];
    }
}

function cdn_url_buffer_start() {
        ob_start("replace_cdn_url_callback");
}

function cdn_url_buffer_end() {
        ob_end_flush();
}

add_action('init', 'cdn_url_buffer_start');
add_action('shutdown', 'cdn_url_buffer_end');