MyShaarli/tests/plugins/test/test.php

<?php

/**
 * Hook for test.
 *
 * @param array $data - data passed to plugin.
 *
 * @return mixed altered data.
 */
function hook_test_random($data)
{
    if (isset($data['_PAGE_']) && $data['_PAGE_'] == 'test') {
        $data[1] = 'page test';
    } elseif (isset($data['_LOGGEDIN_']) && $data['_LOGGEDIN_'] === true) {
        $data[1] = 'loggedin';
    } else {
        $data[1] = $data[0];
    }

    return $data;
}

function hook_test_error()
{
    new Unknown();
}