solved rotates phrases ,, good idea... :)

<?php
/// make sure we are not being called directly
defined('APP_DIR') or exit();

function blRotate_meta(){
    $_tmp = array(
        'name'        => 'Rotate Phrases',
        'url'         => 'rotate',
        'version'     => '0.0.1',
        'developer'   => 'BopLive' . strftime('%Y'),
        'description' => 'Prives a smarty function to rotate promotional phrases',
        'category'    => 'site',
        'license'     => 'mpl',
        'activate'    => true
    );
    return $_tmp;
}

function blRotate_init(){
    return true;
}

function smarty_function_blRotate_rotate_phrases($params, &$smarty)
{
    global $_conf;
    
    $key = 'footer_powered_by';
    if ($footer = jrCore_is_cached('blRotate', $key)) {
        return $footer;
    }

    $_options = array(
        'Phrase 1',
        'Phrase 2',
        'Phrase 3',
        'Phrase 4',
        'etc.',
        'etc.',
        'etc.'
    );
    $k        = array_rand($_options);
    $option   = $_options[$k];
    $footer   = '<span style="font-size:9px;"><a href="' . $_conf['jrCore_base_url'] . '">' . $option . '</a></span>';

    jrCore_add_to_cache('jrCore', $key, $footer);
    return $footer;
}

function smarty_function_blRotate_rotate_phrases($params, &$smarty)
{
    global $_conf;
    
    $key = 'footer_powered_by';
    if ($footer = jrCore_is_cached('blRotate', $key)) {
        return $footer;
    }

    $_options = array(
        'Phrase 1',
        'Phrase 2',
        'Phrase 3',
        'Phrase 4',
        'etc.',
        'etc.',
        'etc.'
    );
    $_links = array(
        ‘http://link_to_Phrase1.com',
        'http://link_to_Phrase2.com',
        'http://link_to_Phrase3.com',
        'http://link_to_Phrase4.com',
        'etc.',
        'etc.',
        'etc.'
    );
    $k        = array_rand($_options);
    $option   = $_options[$k];
    $link     = $_links[$k];
    $footer   = '<span style="font-size:9px;"><a href="' . $link . '">' . $option . '</a></span>';

    jrCore_add_to_cache('jrCore', $key, $footer);
    return $footer;
}