Delete session data after 2 min in php -

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i'm newbie in php , have question. example have in session array variable call game_url:

$_session['game_url'] = $_server['http_referer'];

is possible make $_session['game_url'] = ''; after 2 min after has set? appreciated.

if (!isset($_session['game_url'])) {     $_session['last_activity'] = time();     $_session['game_url'] = $_server['http_referer']; } if (isset($_session['last_activity']) && (time() - $_session['last_activity'] > 120))  {     unset($_session['game_url']);     unset($_session['last_activity']); }

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