先我们看看实现CDN加速功能的步骤。
将本地图片地址替换为CDN地址
添加至主题目录functions.php中：
define('CDN_HOST','http://cdn.mywpku.com');
add_filter('the_content','z_cdn_content');
function z_cdn_content($content){
return str_replace(home_url().'/wp-content/uploads', CDN_HOST.'/wp-content/uploads', $content);
}
add_filter('wp_get_attachment_url','z_get_attachment_url',10,2);
function z_get_attachment_url($url, $post_id){
return str_replace(home_url(), CDN_HOST, $url);
}
注意 define('CDN_HOST','http://cdn.mywpku.com'); 需要替换为你自己的CDN地址。
将主题静态资源地址替换为CDN地址
添加至主题目录functions.php中：
add_filter('stylesheet_directory_uri','z_cdn_stylesheet_directory_uri',10,3);
function z_cdn_stylesheet_directory_uri($stylesheet_dir_uri, $stylesheet, $theme_root_uri) {
return str_replace(home_url(), CDN_HOST, $stylesheet_dir_uri);
}
add_filter('template_directory_uri','z_cdn_template_directory_uri',10,3);
function z_cdn_template_directory_uri($template_dir_uri, $template, $theme_root_uri)
{
return str_replace(home_url(), CDN_HOST, $template_dir_uri);
}
将 wp-content / wp-includes 静态资源替换为CDN地址
@Via：http://www.linuxeye.com/jianzhan/2282.html
define('FocusCDNHost','http://ehsren.com');//wordpress网站网址
define('FocusCDNRemote','http://cdn.ehsren.com');//cdn域名
define('FocusCDNIncludes','wp-content,wp-includes');//设置加速目录
define('FocusCDNExcludes','.php|.xml|.html|.po|.mo');//设置文件白名单
define('FocusCDNRelative','');//Check this if you want to have links like <wp-content/abc.png> rewritten - i.e. without your blog's domain as prefix.
function do_cdnrewrite_ob_start() {
$rewriter = new FocusCDNRewriteWordpress();
$rewriter->register_as_output_buffer();
}
add_action('template_redirect', 'do_cdnrewrite_ob_start');
class FocusCDNRewriteWordpress extends FocusCDNRewrite
{
function __construct() {
$excl_tmp = FocusCDNExcludes;
$excludes = array_map('trim', explode('|', $excl_tmp));
parent::__construct(
FocusCDNHost,
FocusCDNRemote,
FocusCDNIncludes,
$excludes,
!!FocusCDNRelative
);
}
public function register_as_output_buffer() {
if ($this->blog_url != FocusCDNRemote) {
ob_start(array(&$this, 'rewrite'));
}
}
}
class FocusCDNRewrite {
var $blog_url = null;
var $cdn_url = null;
var $include_dirs = null;
var $excludes = array();
var $rootrelative = false;
function __construct($blog_url, $cdn_url, $include_dirs, array $excludes, $root_relative) {
$this->blog_url = $blog_url;
$this->cdn_url = $cdn_url;
$this->include_dirs = $include_dirs;
$this->excludes = $excludes;
$this->rootrelative = $root_relative;
}
protected function exclude_single(&$match) {
foreach ($this->excludes as $badword) {
if (stristr($match, $badword) != false) {
return true;
}
}
return false;
}
protected function rewrite_single(&$match) {
if ($this->exclude_single($match[0])) {
return $match[0];
} else {
if (!$this->rootrelative || strstr($match[0], $this->blog_url)) {
return str_replace($this->blog_url, $this->cdn_url, $match[0]);
} else {
return $this->cdn_url . $match[0];
}
}
}
protected function include_dirs_to_pattern() {
$input = explode(',', $this->include_dirs);
if ($this->include_dirs == '' || count($input) < 1) {
return 'wp\-content|wp\-includes';
} else {
return implode('|', array_map('quotemeta', array_map('trim', $input)));
}
}
public function rewrite(&$content) {
$dirs = $this->include_dirs_to_pattern();
$regex = '#(?<=[(\"\'])';
$regex .= $this->rootrelative
? ('(?:'.quotemeta($this->blog_url).')?')
: quotemeta($this->blog_url);
$regex .= '/(?:((?:'.$dirs.')[^\"\')]+)|([^/\"\']+\.[^/\"\')]+))(?=[\"\')])#';
return preg_replace_callback($regex, array(&$this, 'rewrite_single'), $content);
}
}
wordpress免插件纯代码实现又拍云、七牛CDN加速
wordpress七牛镜像存储插件，WP SUPER CACHE等里面的CDN功能，都可以用代码方式实现。
在七牛或者又拍云设置好CDN后，将下面代码仍入主题的functions.php函数文件中即可。
七牛设置CDN
又拍云设置CDN