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php session deletion

hibbsusan asked
Last Modified: 2012-05-12
How come after I run this session and session cookie clearing script (from Murach's php/mysql)

session_start( );
$_SESSION = array();
$name = session_name();
$expire = strtotime('-1 year');
$params = session_get_cookie_params();

$path = $params['path'];
$domain = $params['domain'];
$secure = $params['secure'];
$httponly = $params['httponly'];
setcookie($name, '', $expire, $path, $domain, $secure, $httponly);

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this code, run immediately afterward:

foreach ($_SESSION as $key=>$val)
	echo $key;
	echo '&nbsp; : &nbsp;';
	echo $val;
	echo '<br>';

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still echos

a  :  asdf

Thank you!
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