How to resolve an exception that occurs when using unset ()

How to resolve errors that occur when using unset ()

PHP Code

  
   
  
   ", $user);        Unset ($user);    printf ("Username now set to:%s
", $user);? >

Why unset () shows notice:undefined variable:user in D:\Apache group\apache2\htdocs\phpproject\index3.php on line 30:


Find out about the function of the session will be some error hints ...

------Solution--------------------
Sorry I didn't look at your code!
Unset ($user); This clears the variable named user from the variable table, so the next line of code will appear $user undefined, and you won't even know what unset () is.
printf ("Username now set to:%s
", $user);
------Solution--------------------
The statement behind the unset, you're testing it, right? That's the right thing to do, but it's not the right hint.

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