Solution seems to be:
if(function_exists('get_sites')) {$sites= get_sites();}
elseif(function_exists('wp_get_sites')) {$sites= wp_get_sites();}
Solution seems to be:
if(function_exists('get_sites')) {$sites= get_sites();}
elseif(function_exists('wp_get_sites')) {$sites= wp_get_sites();}