value, $unique );
If you want to save post meta data when a post is saved, you need to register a callback function using the save_post action hook:
add_action( 'save_post', 'my_custom_post_meta' );
So the code you posted simply defines a function my_custom_post_meta() which uses add_post_meta() to add post meta data, and it registers that function as a callback for the save_post action hook.
This code adds an action to WordPress which redirects the user to the contact page when the about page is visited. The redirection is done
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This code creates a WordPress post with the values of the ‘post_title’ and ‘post_content’ variables. It sets the post status to ‘publish’ and the author
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This code updates the ‘blogname’ option to the new value ‘New Site Name’ in the WordPress database. The goal is to update the site title/name
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