Redirecting with $_POST

I would like to pass $_POST data on successful completion of a form. 

This will place my form data into $_SESSION as an array 

PHP Code:

redirect()->route('education')->with('report', 'Session Saved')->withInput(); 


I can get to this via 

PHP Code:

session('_ci_old_input')['post'] 


but not the individual values, for a reason I don't understand. 
It feels as though there must be a more elegant way to access '_ci_old_input' but I'm not sure what it is. 



How can I pass $_POST data on to a new page with redirect() ? 

Happy to try a different strategy. Flash Session data?