bp_groups_admin_autocomplete_handler()

function bp_groups_admin_autocomplete_handler() {

	// Bail if user user shouldn't be here, or is a large network.
	if ( ! bp_current_user_can( 'bp_moderate' ) || bp_is_large_install() ) {
		wp_die( -1 );
	}

	$term     = isset( $_GET['term'] )     ? sanitize_text_field( $_GET['term'] ) : '';
	$group_id = isset( $_GET['group_id'] ) ? absint( $_GET['group_id'] )          : 0;

	if ( ! $term || ! $group_id ) {
		wp_die( -1 );
	}

	$suggestions = bp_core_get_suggestions( array(
		'group_id' => -$group_id,  // A negative value will exclude this group's members from the suggestions.
		'limit'    => 10,
		'term'     => $term,
		'type'     => 'members',
	) );

	$matches = array();

	if ( $suggestions && ! is_wp_error( $suggestions ) ) {
		foreach ( $suggestions as $user ) {

			$matches[] = array(
				// Translators: 1: user_login, 2: user_email.
				'label' => sprintf( __( '%1$s (%2$s)', 'buddyboss' ), $user->name, $user->ID ),
				'value' => $user->ID,
			);
		}
	}

	wp_die( json_encode( $matches ) );
}