PHP - Setting session timeout

Session timeout setting is necessary For high-security sites . Php default session timeout time is 20 minutes.

There is 2 functions for change the session timeout.


1. Sets the timeout of a current session and

2. Verifies whether the session is still valid given the specified timeout variable set in above function .


function check_login() {
@session_start();
$expiration_time = intval($_SESSION['session_expiration']);
//if session is still valid
if ($time() < $expiration_time) {
validate_session('600'); // -> make it valid for another 600 secs
return true;
}
 else {
unset($_SESSION['session_expiration']);
return false;

}
}

function validate_session($timeout) {
@session_start();
$_SESSION['session_expiration'] = time() + $timeout;
}

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