(PHP 4, PHP 5, PHP 7, PHP 8)
session_module_name — Get and/or set the current session module
session_module_name() gets the name of the current session module, which is also known as session.save_handler.
module
       If module is specified and not null, that module will be
       used instead.
       Passing "user" to this parameter is forbidden. Instead
       session_set_save_handler() has to be called to set a user
       defined session handler.
      
   Returns the name of the current session module,  or false on failure.
  
| Version | Description | 
|---|---|
| 8.0.0 | 
       module is nullable now.
       | 
     
| 7.2.0 | 
       It is now explicitly forbidden to set the module name to
       "user". Formerly, this has been silently ignored.
       |