Como mostrar contenido al Azar en PHP

<?php
$content = array(
    'http://www.address1.com|image1|Caption 1',
    'http://www.address2.com|image2|Caption 2',
    'http://www.address3.com|image3|Caption 3',
    'http://www.address4.com|image4|Caption 4'
);


shuffle($content);


foreach ($content as $value)
{
    $explode = explode('|', $value);
    echo '<p><a href="' . $explode[0] . '"><img src="/misc/php/shuffle/' . $explode[1] . '.gif" border="0" width="100" height="25" align="absmiddle"></a>  <a href="' . $explode[0] . '">' . $explode[2] . '</a></p>';
}
?>