纯代码实现WordPress文章远程图片(外链)自动本地化

// 自动本地化外链图片
add_filter('content_save_pre', 'auto_save_image');
function auto_save_image($content) {
    $upload_path = '';
    $upload_url_path = get_bloginfo('url');
    //上传目录
    if (($var = get_option('upload_path')) !=''){
        $upload_path = $var;
    } else {
        $upload_path = 'wp-content/uploads';
    }
    if(get_option('uploads_use_yearmonth_folders')) {
        $upload_path .= '/'.date("Y",time()).'/'.date("m",time());
    }
    //文件地址
    if(($var = get_option('upload_url_path')) != '') {
        $upload_url_path = $var;
    } else {
        $upload_url_path = bloginfo('url');
    }
    if(get_option('uploads_use_yearmonth_folders')) {
        $upload_url_path .= '/'.date("Y",time()).'/'.date("m",time());
    }
    require_once ("../wp-includes/class-snoopy.php");
    $snoopy_Auto_Save_Image = new Snoopy;
    $img = array();
    //以文章的标题作为图片的标题
    if ( !empty( $_REQUEST['post_title'] ) )
        $post_title = wp_specialchars( stripslashes( $_REQUEST['post_title'] ));
    $text = stripslashes($content);
    if (get_magic_quotes_gpc()) $text = stripslashes($text);
    preg_match_all("/ src=(\"|\'){0,}(http:\/\/(.+?))(\"|\'|\s)/is",$text,$img);
    $img = array_unique(dhtmlspecialchars($img[2]));
    foreach ($img as $key => $value){
        set_time_limit(180); //每个图片最长允许下载时间,秒
        if(str_replace(get_bloginfo('url'),"",$value)==$value&&str_replace(get_bloginfo('home'),"",$value)==$value){
            //判断是否是本地图片，如果不是，则保存到服务器
            $fileext = substr(strrchr($value,'.'),1);
            $fileext = strtolower($fileext);
            if($fileext==""||strlen($fileext)>4)
                $fileext = "jpg";
            $savefiletype = array('jpg','gif','png','bmp');
            if (in_array($fileext, $savefiletype)){
                if($snoopy_Auto_Save_Image->fetch($value)){
                    $get_file = $snoopy_Auto_Save_Image->results;
                }else{
                    echo "error fetching file: ".$snoopy_Auto_Save_Image->error."<br>";
                    echo "error url: ".$value;
                    die();
                }
                $filetime = time();
                $filepath = "/".$upload_path;//图片保存的路径目录
                !is_dir("..".$filepath) ? mkdirs("..".$filepath) : null;
                //$filename = date("His",$filetime).random(3);
                $filename = substr($value,strrpos($value,'/'),strrpos($value,'.')-strrpos($value,'/'));
                //$e = '../'.$filepath.$filename.'.'.$fileext;
                //if(!is_file($e)) {
                // copy(htmlspecialchars_decode($value),$e);
                //}
                $fp = @fopen("..".$filepath.$filename.".".$fileext,"w");
                @fwrite($fp,$get_file);
                fclose($fp);
                $wp_filetype = wp_check_filetype( $filename.".".$fileext, false );
                $type = $wp_filetype['type'];
                $post_id = (int)$_POST['temp_ID2'];
                $title = $post_title;
                $url = $upload_url_path.$filename.".".$fileext;
                $file = $_SERVER['DOCUMENT_ROOT'].$filepath.$filename.".".$fileext;
                //添加数据库记录
                $attachment = array(
                    'post_type' => 'attachment',
                    'post_mime_type' => $type,
                    'guid' => $url,
                    'post_parent' => $post_id,
                    'post_title' => $title,
                    'post_content' => '',
                );
                $id = wp_insert_attachment($attachment, $file, $post_parent);
                $text = str_replace($value,$url,$text); //替换文章里面的图片地址
            }
        }
    }
    $content = AddSlashes($text);
    remove_filter('content_save_pre', 'auto_save_image');
    return $content;
}
function mkdirs($dir){
    if(!is_dir($dir)){
        mkdirs(dirname($dir));
        mkdir($dir);
    }
    return ;
}
function dhtmlspecialchars($string) {
    if(is_array($string)) {
        foreach($string as $key => $val) {
            $string[$key] = dhtmlspecialchars($val);
        }
    }else{
        $string = str_replace('&', '&', $string);
        $string = str_replace('"', '"', $string);
        $string = str_replace('<', '<', $string);
        $string = str_replace('>', '>', $string);
        $string = preg_replace('/&(#\d;)/', '&\1', $string);
    }
    return $string;
}

以后你发表文章时就不用去管文章中的外链图片了，因为上面的代码会自动将文章中包含的外链图片自动保存到本地，是不是很方便的 wordpress 技巧呀。

好了，拿去试一试吧，我也不能保证在你那里能正常运行，不正常的请反馈，我这边是正常使用。