WordPress sets the article reading permission (open to search engines)

Implementation code

If page caching is not enabled for your WordPress site, this requirement is not hard to achieve, we can refer to the WordPress previously written seo/seo.html "target =" _ blank "> The search engine hides the code in a specific article and makes some modifications. Add the following php code to the functions. php file of the current topic and use UTF8 to save the code:

The code is as follows:

Copy code

// Add option on the article/page editing page Function ludouseo_add_custom_box (){ Add_meta_box ('ludou _ se_only ', 'search engine exclusive', 'ludou _ se_only ', 'post', 'side', 'Low '); Add_meta_box ('ludou _ se_only ', 'search engine exclusive', 'ludou _ se_only ', 'page', 'side', 'Low '); } Add_action ('add _ meta_boxes ', 'ludouseo _ add_custom_box '); Function ludou_se_only (){ Global $ post;   // Add verification fields Wp_nonce_field ('ludou _ se_only ', 'ludou _ se_only_nonce ');   $ Meta_value = get_post_meta ($ post-> ID, 'Dou _ se_only ', true ); If ($ meta_value) Echo '<input name = "ludou-se-only" type = "checkbox" checked = "checked" value = "1"/> allows only search engines to view '; Else Echo '<input name = "ludou-se-only" type = "checkbox" value = "1"/> allows only search engines to view '; } // Save option settings Function ludouseo_save_postdata ($ post_id ){ // Verify If (! Isset ($ _ POST ['ludou _ se_only_nonce ']) Return $ post_id; $ Nonce = $ _ POST ['ludou _ se_only_nonce '];   // Verify that the field is valid If (! Wp_verify_nonce ($ nonce, 'Dou _ se_only ')) Return $ post_id;    // Determine whether to save automatically If (defined ('Doing _ AUTOSAVE ') & DOING_AUTOSAVE) Return $ post_id;      // Verify user permissions If ('page' = =$ _ POST ['post _ type']) { If (! Current_user_can ('edit _ page', $ post_id )) Return $ post_id;   } Else { If (! Current_user_can ('edit _ post', $ post_id )) Return $ post_id;   }   // Update settings If (! Empty ($ _ POST ['ludou-se-only']) Update_post_meta ($ post_id, 'ludou _ se_only ', '1 '); Else Delete_post_meta ($ post_id, 'ludou _ se_only '); } Add_action ('SAVE _ post', 'ludouseo _ save_postdata '); Function do_ludou_se_only (){ // This function is only valid for articles and pages If (is_singular ()){ Global $ post; $ Is_robots = 0; $ Ludou_se_only = get_post_meta ($ post-> ID, 'ludou _ se_only ', true );    If (! Empty ($ ludou_se_only )){ // The following is the search engine Agent keyword array // It's a little simple. Please optimize it yourself. $ Bots = array ( 'Baidider ', 'Googlebot ', 'Sogou spider ', 'Sogou web spider ', 'Yodaobot ', 'Bingbot ', '360spider ', 'Slup ', 'Msnbot ', 'Yahoo-blogs ', 'Psbot ', 'Yandex ', 'Www. 111cn. Net ', 'Blogsearch ', 'Easouspider ', 'Mediapartners-Google' );    $ Useragent = $ _ SERVER ['http _ USER_AGENT '];    If (! Empty ($ useragent )){ Foreach ($ bots as $ lookfor ){ If (stristr ($ useragent, $ lookfor )! = False ){ $ Is_robots = 1; Break;           }         }       }      // If it is not a search engine, an error message is displayed. // Logged-on users are not affected If (! $ Is_robots &&! Is_user_logged_in ()){ Wp_die ('you are not authorized to view this article! ');       }     }   } } Add_action ('WP ', 'Do _ ludou_se_only ');

Usage

After successfully adding the above code to functions. php of the current topic, we can use it normally. It is completely silly. On the WordPress background article and page editing page, we can see the following selection box at the bottom of the right sidebar:

 

If you want to disable search engine crawling on the current article/page, select this option. When checked, the following error message is displayed when this article/page is accessed by a common visitor (the search engine and logged-on users are not affected ):

Original article from: ludou.org