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apply_filters( 'pre_get_blogs_of_user', null|array $sites, int $user_id, bool $all )

Filters the list of a user’s sites before it is populated.

Returning a non-null value from the filter will effectively short circuit get_blogs_of_user(), returning that value instead.

$sites: (null|array) An array of site objects of which the user is a member.
$user_id: (int) User ID.
$all: (bool) Whether the returned array should contain all sites, including those marked 'deleted', 'archived', or 'spam'. Default false.

Used By	Description
wp-includes/user.php: get_blogs_of_user()	Get the sites a user belongs to.

Version	Description
4.6.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/pre_get_blogs_of_user