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is_random_header_image

Check if random header image is in use.Always true if user expressly chooses the option in Appearance > Header. Also true if theme has multiple header images registered, no specific header image is chosen, and theme turns on random headers with add_theme_support().

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is_protected_meta

Determine whether a meta key is protected

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is_multi_author

Does this site have more than one authorChecks to see if more than one author has published posts.

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is_wp_error

Check whether variable is a WordPress Error.Looks at the object and if a WP_Error class. Does not check to see if the parent is also WP_Error, so can’t inherit WP_Error and still use this function.

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is_user_admin

Whether the current request is for a user admin screen /wp-admin/user/Does not inform on whether the user is an admin! Use capability checks to tell if the user should be accessing a section or not.

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