纯代码实现WordPress远程图片本地化

WordPress测试版本：5.4

//将远程图片地址 本地化 这个在前台编辑器中使用时会有问题
function post_save_images($content) {
    set_time_limit(240);
    global $post;
    $post_id = $post->ID;
    $preg = preg_match_all('/<img.*?src="(.*?)"/', stripslashes($content) , $matches);
    if ($preg) {
        $i = 1;
        foreach ($matches[1] as $image_url) {
            if (empty($image_url)) continue;
            $pos = strpos($image_url, get_bloginfo('url'));
            if ($pos === false) {
                $file = file_get_contents($image_url);
                $filename = basename($image_url);
                //preg_match( '/(.*?)(\.\w+)$/', $filename, $match );
                $im_name = $filename;
                $res = wp_upload_bits($im_name, '', $file);
                $dirs = wp_upload_dir();
                $filetype = wp_check_filetype($file);
                $attachment = array(
                    'guid' => $dirs['baseurl'] . '/' . _wp_relative_upload_path($file) ,
                    'post_mime_type' => $filetype['type'],
                    'post_title' => preg_replace('/\.[^.]+$/', '', basename($file)) ,
                    //preg_replace 搜索并替换
                    'post_content' => '',
                    'post_status' => 'inherit'
                );
                $attach_id = wp_insert_attachment($attachment, $file, $id);
                $attach_data = wp_generate_attachment_metadata($attach_id, $file);
                //wp_generate_attachment_metadata
                wp_update_attachment_metadata($attach_id, $attach_data);
                //if($i==1 ){
                //set_post_thumbnail( $post_id, $attach_id );
                //}
                $replace = $res['url'];
                $content = str_replace($image_url, $replace, $content);
            }
            $i++;
        }
    }
    remove_filter('content_save_pre', 'post_save_images');
    return $content;
}
if (is_admin()) {//只允许管理员使用本地化
    add_filter('content_save_pre', 'post_save_images');
}

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