There are many things have to be done on background, for instance, version check, update theme, delete posts, delayed posting, delete transients, etc. In WordPress this background job is performed by WP-Cron, witch is defined in wp-cron.php file. WordPress cron is the system built-in process that handles the scheduling of time-based tasks. Out-of-the-box, WordPress performs a number of scheduled tasks, they include: WordPress core update checks Plugin update checks Theme update checks Publishing of scheduled posts WP-Cron takes its name from cron, which is a time-based job scheduler in Unix-like systems. However, WP-Cron is designed to work on any hosting provider (including shared hosting) without using any external software or tools for scheduling events. Problem of WP-Cron The wp-cron.php is triggered on every http request. If any scheduled event is due, the event is spawned to wp-cron.php for processing, so the event is triggered to run. This is unreliable, espectially for low traffic sites, or heavily cached sites, cause scheduled events to be missed if no traffic is received for a prolonged period of time. For high-traffic sites, WP-Cron is extremely inefficient. This is because WP-Cron will check for scheduled events on every page load. This could mean that the cron schedules are being checked multiple times per second. This is unnecessary and highly redundant, as scheduled events typically run in minutes or hourly, even monthly interval. Even wp-cron.php creates a lock in WordPress transient, witch stored in wp_options table, but for high traffice sites the high concurrent requests may still spawn multiple requests to wp-cron.php, thus increasing server load.…
What is in $wpdb object WordPress provides a global object, $wpdb , which is an instantiation of the wpdb class. By default, $wpdb is instantiated to access the WordPress database, but it can be used to manipulate any table in the WordPress database, not just those created by WordPress itself. With the following code include "../../wp-config.php"; print_r($wpdb); We will get result as (original data before formatting): wpdb Object ( [show_errors] => [suppress_errors] => [last_error] => [num_queries] => 42 [num_rows] => 0 [rows_affected] => 0 [insert_id] => 0 [last_query] => SELECT option_value FROM wp_options WHERE option_name = 'pods_upload_require_login_cap' LIMIT 1 [last_result] => Array ( ) [result:protected] => mysqli_result Object ( [current_field] => 0 [field_count] => 1 [lengths] => [num_rows] => 0 [type] => 0 ) [col_meta:protected] => Array ( ) [table_charset:protected] => Array ( ) [check_current_query:protected] => 1 [checking_collation:wpdb:private] => [col_info:protected] => [queries] => [reconnect_retries:protected] => 5 [prefix] => wp_ [base_prefix] => wp_ [ready] => 1 [blogid] => 0 [siteid] => 0 [tables] => Array ( [0] => posts [1] => comments [2] => links [3] => options [4] => postmeta [5] => terms [6] => term_taxonomy [7] => term_relationships [8] => termmeta [9] => commentmeta ) [old_tables] => Array ( [0] => categories [1] => post2cat [2] => link2cat ) [global_tables] => Array ( [0] => users [1] => usermeta ) [ms_global_tables] => Array ( [0] => blogs [1] => blogmeta [2] => signups [3] => site [4] => sitemeta [5] => sitecategories [6] => registration_log ) [comments] => wp_comments [commentmeta] => wp_commentmeta [links] => wp_links [options] => wp_options [postmeta] => wp_postmeta [posts] =>…
Instead of JavaScript, CSS also can do some tricks to make magic happen. CSS can maintain counter variables to inrease the value, and also add some content before and after a block, emphasize first letter of a paragraph, mandatory fields validation, etc. Counters Demo 1 Effect Code <head> <style> body { counter-reset:sec-counter; /* Set "sec-counter" to 0 */ } h2::before { counter-increment:sec-counter; /*Increment "sec-counter" by 1*/ content:"Section " counter(sec-counter) ". "; } </style> </head> <body> <h2>HTML Tutorial</h2> <h2>CSS Tutorial</h2> <h2>JavaScript Tutorial</h2> <h2>Bootstrap Tutorial</h2> <h2>SQL Tutorial</h2> <h2>PHP Tutorial</h2> </body> Demo 2 Effect Code <head> <style> body{ counter-reset:section; /* define counter */ counter-reset:heading; } h1:before{ counter-increment: heading; content:counter(heading) " - "; } h1{ counter-reset: subheading; } h2:before{ content: counter(heading) "." counter(subheading) ") "; counter-increment: subheading; } h2{ counter-reset: section; /* define counter */ } h3:before{ content: counter(heading) "." counter(subheading) "." counter(section) ") "; /*content: counter(section) ": ";*/ counter-increment: section; } </style> </head> <body> <h3>Heading 3, no counter</h3> <h3>Heading 3, no counter</h3> <h1>Heading 1</h1> <h2>Subheading</h2> <h2>Subheading</h2> <h3>Heading 3</h3> <h3>Heading 3</h3> <h1>Heading 1</h1> <h2>Subheading</h2> <h2>Subheading</h2> </body> Demo 3 Effect Code <dhead> <style> ol{ counter-reset: counter; list-style-type: none; } li::before{ counter-increment: counter; content: counters(counter, ".") " "; } </style> </head> <body> <ol> <li>item</li> <li>item</li> <ol> <li>item</li> <li>item</li> <li> <ol> <li>item</li> <li>item</li> <li>item</li> </ol> </li> <li>item</li> </ol> <li>item</li> <li>item</li> </ol> <ol> <!-- restart counter --> <li>item</li> <li>item</li> </ol> </body> Mask Effect Code <head> <style> body{ background-color: rgb(124, 156, 216); } img{ width:900px; mask-image:linear-gradient(to top,transparent 25%, rgb(50, 13, 184) 75%); -webkit-mask-image: linear-gradient(to left,transparent 25%, #000 75%); } </style> </head> <body> <img src="toronto city hall.jpg"> </body> First Letter…
<<< These scripts were tested on MS SQL Server 2019 >>> From time to time we need to generate huge data for testing. Without any data generating tool we can achieve it by using some SQL Scripts. these scripts are different from regular query scripts. Generate list of data CREATE TABLE #accounts ( fname VARCHAR(20), lname VARCHAR(20)) GO INSERT #accounts VALUES ('Fred', 'Flintstone') GO 1000 SELECT TOP 10 * FROM #accounts fname lname Fred Flintstone Fred Flintstone Fred Flintstone Fred Flintstone Fred Flintstone Fred Flintstone Fred Flintstone Fred Flintstone Fred Flintstone Fred Flintstone ALTER TABLE #accounts ADD id INT IDENTITY(1,1) SELECT TOP 10 * FROM #accounts GO fname lname id Fred Flintstone 1 Fred Flintstone 2 Fred Flintstone 3 Fred Flintstone 4 Fred Flintstone 5 Fred Flintstone 6 Fred Flintstone 7 Fred Flintstone 8 Fred Flintstone 9 Fred Flintstone 10 ALTER TABLE #accounts ADD id INT DECLARE @id INT SET @id = 0 UPDATE #accounts SET @id = id = @id + 1 OPTION ( MAXDOP 1 ) GO SELECT * FROM #accounts GO fname lname id Fred Flintstone 1 Fred Flintstone 2 Fred Flintstone 3 Fred Flintstone 4 Fred Flintstone 5 Fred Flintstone 6 Fred Flintstone 7 Fred Flintstone 8 Fred Flintstone 9 Fred Flintstone 10 Note: MAXDOP is max degree of parallelism, set it to 1 to avoid duplicate value if running on multiple processors machine. Read article 1 for detail. Generate sequence numbers Using sys.all_columns table SELECT TOP (1000) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM sys.all_columns Generate huge Rows using CROSS JOIN SELECT ROW_NUMBER()…
1. Install MySQL ODBC Connector. Download it here: https://dev.mysql.com/downloads/connector/odbc/ 2. Run ODBC Search for ODBC Data Source, select 32 or 64 bit based on your OS. My OS is Windows 10 64bit, so I select 64-bit. 3. Add a new DSN Click on Add button to add a new DSN select MySQL ODBC Driver Enter parmeters to the screen. In order to complete the PCI compliance requirements the remote MySQL connection to the server's primary IP is blocked. For establishing a remote MySQL connection to a database you have to use the server's secondary IP. The secondly IP is shown on Remote database access hosts screen. 4. Test connection Click on Test button to verify the connection is working. DONE. 613 total views
Author information is an important part of a blog, but for some reason you have to hide it. For example, the blog is a result of multiple authors. 1. Simply hide author information using stylesheet. Add custom css (look like the following): .author,.postauthor-container { display:none; visibility:hidden; } .uwp_widget_author_box { display:none; visibility:hidden; } /* UserWP plugin */ 2. Using "Hide/Remove Metadata" plugin 3. Change code The author information is written by theme, so you have to find out the php code location in order to make change. The possible location is on the following files: single.php, content.php, archive.php, index.php, functions.php, template-tags.php For example, in the theme "Twenty Nineteen" the code is on "twentynineteen_posted_by" function in template-tags.php file. Note that, before making any change on the theme code please make a full backup. Hope this informaiton will help some people :) 7,734 total views, 36 views today
There are many ways to improve WordPress performance. But here I would introduce a trick to dramatically improve the page loading speed. Convert to html page As a web page the ultimate content is html code. If we could response in html directly without bothering the server code and database to run the page would be loaded really quick. make sure the web page working as expected use browser developer tool to view the source copy the html source code go to File Manager of the CPanel, manually create folders and index.html file according to the url pathFor example: for url "https://hostlike.com/zh/web-hosting/"create folder /zh/web-hosting/, then create file index.html under the new folder open index.html with file editor paste the copied content to the index.html file save the content. Dynamic content trick If there is dynamic content, e.g. shopping cart item number. We can use JavaScript to update the value. Add the following JavaScript code to the end of index.html content. function getCookie(name) { const value = `; ${document.cookie}`; const parts = value.split(`; ${name}=`); if (parts.length === 2) return parts.pop().split(';').shift(); } var cart_count = getCookie('woocommerce_items_in_cart'); $('.wcmenucart-details').text(cart_count); 12,214 total views, 36 views today
The administrator role somehow loss admin privillage, to restore it as an admin, we could update 2 rows information in database easily. The following DML will restore the admin privillage. set @id=1; update wp_usermeta set meta_value='10' where user_id=@id and meta_key='wp_user_level' update wp_usermeta set meta_value='a:1:{s:13:"administrator";b:1;}' where user_id=@id and meta_key='wp_capabilities' The admin role is controlled by user level and capability attributes, and these information are stored in wp_usermeta table. User level: User Level 0 converts to Subscriber User Level 1 converts to Contributor User Level 2 converts to Author User Level 3 converts to Editor User Level 4 converts to Editor User Level 5 converts to Editor User Level 6 converts to Editor User Level 7 converts to Editor User Level 8 converts to Administrator User Level 9 converts to Administrator User Level 10 converts to Administrator Capability: Refer to: Roles and Capabilities for detail information. In wp_usermeta table the meta_value stored as role: Admin: a:1:{s:13:"administrator";b:1;} Author: a:1:{s:6:"author";b:1;} Contributor: a:1:{s:11:"contributor";b:1;} Subscriber: a:1:{s:10:"subscriber";b:1;} 7,931 total views, 30 views today
Gmail allows external users to send email from its SMTP server. You could set it up in gmail settings or google admin settings.
Scenario Certain contents are allowed by specific group of users to access. Membership roles concept With Members plugin, user roles can be managed in dashboard. Role permissions are called capability. The capabilities are defined based on themes and plugins. The following figure shows the basic role capabilities. Solution Add a user role that allows users to access those restricted contents. Steps 1. Members plugin Install plugin called "Members – Membership & User Role Editor Plugin". 2. Setup roles Go to Members on the left menu of Dashboard. Here you could add a new role or edit an existing role, and then assign permissions, which called capability within the plugin, to the role. 3. Add user to a role Go to Users menu, click on the user that you want to edit. Scrolldown to the bottom, the last section is User Roles. Select the role to assign. 4. Restrict page access by role On the page/post editor, scrolldown to the last section "Content Permission", assign page with the role that is allowed to access the page/post. Done. Now you have restrict the page to be accessed only the users with the role. 344 total views, 5 views today
