Using WordPress ‘is_admin()’ PHP function
Determines whether the current request is for an administrative interface page.
array
Using WordPress ‘is_email()’ PHP function
The `is_email()` function in WordPress checks whether a given string is a valid email address or not
Using WordPress ‘media_upload_header()’ PHP function
The `media_upload_header()` function is used in WordPress to output the legacy media upload header
Using WordPress ‘media_single_attachment_fields_to_edit()’ PHP function
Retrieves the single non-image attachment fields to edit form fields.