i was able to fix my XCART Version 4.1.10 to perfect work under PHP 5.4 just by going to the check_requirements.php and editing line 162 from 1 to 0 for the option :
if (phpversion() >= "5.0.0") {
$CHECK_REQUIREMENTS["req_vars"][] = array (
"option" =>"register_long_arrays",
"req_val" =>1,
"real_val"=>"",
"critical"=>0);
}
i hope this can help anybody else with the same issue
Junior