Use this code snippet to add the same meta data value for multiple WordPress posts at once. Here I provided solutions that save one custom field in many posts.
Here I shared a code that you can use to switch the WordPress theme to your custom theme. Only the name of the theme is required in this code to make your theme always the selected one for visitors.
If you do not see the set featured image box beside the post editor in the WordPress admin panel to set the featured image of posts, your solution is here. Just copy/paste this code snippet to the function.php file of your theme.
add_theme_support function in WP will register a feature for the specified theme. Here are a few examples of using the add_theme_support() function in WordPress development.
Learn how to add a new section to the settings page of the WordPress admin panel with examples. In this WordPress tutorial, we’ll introduce the WordPress add_settings_section function and review its usage with examples.
Learn how to activate a plugin in WP using the activate_plugin function programmatically. Here we provided an example of using this function to activate a WP plugin.
Learn Extending Posts Query in WP, Join Custom Tables and add new fields to Post Items In this advanced WordPress Development tutorial.