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Check if user exists by ID in WordPress
* Does this user exist?
* @param int|string|WP_User $user_id User ID or object.
* @return bool Whether the user exists.
function km_does_user_exist( $user_id = '' ) {
if ( $user_id instanceof WP_User ) {
$user_id = $user_id->ID;
return (bool) get_user_by( 'id', $user_id );
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