PHP $_session Member Login instance sharing _php Tips

PHP Member Login module is a very simple website development module, this example mainly to PHP beginners a simple reference, the logic of which is still to the reader to understand, many more thinking.
login.php file

<?php Ob_start ();
  Session_Start ();?>
  Error_reporting (E_all); Ini_set ("Display_errors", 1);?>  

logout.php file

<?php
  session_start ();
  unset ($_session["username"]);
  unset ($_session["password"]); 
  Echo ' You have cleaned session ';
  Header (' Refresh:2; Url=login.php ');
? >

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