// See also http://www.php-form-generator.com/phpmyedit/cheat-sheet/filters.txt

// To persist one of *your* variables in all GET/POST query strings,
// specify a key and a value.

$opts['cgi']['persist'] = array('key' => $value);

// Un-tested

$opts['cgi']['persist'][] = array('key2' => $value2);


// Persist $pageid

$opts['cgi']['persist'] = array('pageid' => $pageid);

// Persist 3 variables a, b, and c:

$opts['cgi']['persist'] = array( 'a' => $a, 'b' => $b, 'c' => $c );

// If your user session id is set as $_SESSION['user_id'] then

if(!empty($_SESSION['user_id'])){

   $opts['cgi']['persist'] = array('user_id' => $_SESSION['user_id']);

}

// One-liner

$opts['cgi']['persist'] = isset($_SESSION['user_id']) ? array('user_id' => $_SESSION['user_id']) : '';