html - php form tags not working? (undefined variable error) -

first of all, using wamp server , learning basic php grammar.

so first form php file is

<form action="foo.php" method="post"> name:  <input type="text" name="username" /><br /> email: <input type="text" name="email" /><br /> <input type="submit" name="submit" value="submit me!" /> </form> 

and foo.php file is

<?php  // available since php 4.1.0  echo $_post['username']; echo $_request['username'];  import_request_variables('p', 'p_'); echo $p_username;  // of php 5.0.0, these long predefined variables can // disabled register_long_arrays directive.  echo $http_post_vars['username'];  // available if php directive register_globals = on. of  // php 4.2.0 default value of register_globals = off. // using/relying on method not preferred.  echo $username; ?> 

but when open localhost/form2.php works fine , input "username" , "email". after gives following error:

notice: undefined variable: http_post_vars in c:\wamp\www\foo.php on line 13 notice: undefined variable: username in c:\wamp\www\foo.php on line 19

apparently, these codes supposed work,, it's not working me reason. there wrong wamp server? or possibly wrong how set configuration?? thank !

as can read on php.net, $http_post_vars deprecated. not available anymore since php5.4, no wonder says undefined variable.

$username, works register_globals=on - wamp has on off, should be.

summa summarum: use $_post