GetConVarString is a void function it doesn't return anything, you value is now in your oXc variables.
PHP Code:
public Menu RegrasMenu()
{
char custom_mt[64];
char o1c[64];
GetConVarString(o1, o1c, sizeof(o1c));
...
GetConVarString(mtitle, custom_mt, sizeof(custom_mt));
// MENU DEFINING OPTIONS
Menu rm = new Menu(rm_handler, MENU_ACTIONS_ALL);
if(strlen(custom_mt) > 0)
{
rm.SetTitle("%i", menu_title);
}
else if(strlen(custom_mt) < 0)
{
rm.SetTitle("Regras Do Servidor");
}
if(strlen(o1c) > 0)
{
rm.AddItem("1", "%i", o1c);
}
...
rm.ExitButton = true;
rm.ExitBackButton = false;
return rm;
}