The hook occurs in the following file:
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/** * Filters a user's capabilities depending on specific context and/or privilege. * * @since 2.8.0 * * @param array $caps Returns the user's actual capabilities. * @param string $cap Capability name. * @param int $user_id The user ID. * @param array $args Adds the context to the cap. Typically the object ID. */ return apply_filters( 'map_meta_cap', $caps, $cap, $user_id, $args ); } /** * Whether the current user has a specific capability. * * While checking against particular roles in place of a capability is supported * in part, this practice is discouraged as it may produce unreliable results. * * Note: Will always return true if the current user is a super admin, unless specifically denied.