rolestrue.php

<?php

$roles = array('ROLE_USER', 'ROLE_ADMIN');
if ( ! in_array('RULE_SUPER_ADMIN', $roles)) {
    echo "RULE_SUPER_ADMIN not found\n";
}

$roles = array('ROLE_USER', 'ROLE_ADMIN',true);
if (in_array('RULE_SUPER_ADMIN', $roles)) {
    echo "RULE_SUPER_ADMIN found: it is not funny\n";
}