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/**
* Return a themed set of links.
*
* @param $links
*   A keyed array of links to be themed.
* @param $attributes
*   A keyed array of attributes
* @return
*   A string containing an unordered list of links.
*/
function phptemplate_links($links, $attributes = array('class' => 'links')) {
$output = '';

if (count($links) > 0) {
$num_links = count($links);
$i = 1;

$items_str = '';
foreach ($links as $key => $link) {
$class = '';

// Automatically add a class to each link and also to each LI
if (isset($link['attributes']) && isset($link['attributes']['class'])) {
$link['attributes']['class'] .= ' ' . $key;
$class = $key;
}
else {
$link['attributes']['class'] = $key;
$class = $key;
}

// Add first and last classes to the list of links to help out themers.
$extra_class = '';
if ($i == 1) {
$extra_class .= 'first ';
}
if ($i == $num_links) {
$extra_class .= 'last ';
}

// Is the title HTML?
$html = isset($link['html']) && $link['html'];

// Initialize fragment and query variables.
$link['query'] = isset($link['query']) ? $link['query'] : NULL;
$link['fragment'] = isset($link['fragment']) ? $link['fragment'] : NULL;

//Check if we have a link, for sometimes we need to output just a splain string.
//A class can only contain spaces, hyphens or underscores. Translate these to underscores.
$func_class = strtr($link['attributes']['class'], '- ', '__');
//dpm($func_class);
if (isset($link['href'])) {
//First, see if we have a theme function for this class
if (!empty($func_class) && ($function = theme_get_function('links_'. $func_class))) { //then,  look for a theme function based on the class.
dpm($function);
$items_str .= theme('links_'. $func_class, $link);
}
else { //If no specific function was found, fall back to a default.
$items_str .= '<li class="'. $extra_class . $class .'">';
$items_str .= l($link['title'], $link['href'], $link['attributes'], $link['query'], $link['fragment'], FALSE, $html);          $items_str .= "</li>
";
}
}
else if ($link['title']) {
//Some links are actually not links, but we wrap these in <span> for adding title and class attributes
if (!$html) {
$link['title'] = check_plain($link['title']);
}
$items_str .= '<span'. drupal_attributes($link['attributes']) .'>'. $link['title'] .'</span>';
}

$i++;
}
$output = '<ul'. drupal_attributes($attributes) .'>'. $items_str .'</ul>';
}

return $output;
}

/**
* Theme callbakc from theme_links, renders the comment_add link
**/
function phptemplate_links_comment_add($ink) {
$output =  '"<li class="'. $extra_class . $class .'">';
$output .= l($link['title'], $link['href'], $link['attributes'], $link['query'], $link['fragment'], FALSE, $html);
$output .= "</li>
";
}

source