Using WordPress ‘is_wp_error()’ PHP function
Checks whether the given variable is a WordPress Error.
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Using WordPress ‘is_post_publicly_viewable()’ PHP function
The `is_post_publicly_viewable()` function in WordPress returns `true` if a post is publicly viewable and `false` otherwise
Using WordPress ‘install_network()’ PHP function
The `install_network()` function in WordPress is used to install a new network for a WordPress multisite installation
Using WordPress ‘image_attachment_fields_to_edit()’ PHP function
Retrieves the image attachment fields to edit form fields.