source: extensions/Copyrights/image.php

<?php

// Add an event handler for a prefilter
add_event_handler('loc_begin_picture', 'copyrights_set_prefilter_add_to_pic_info', 55 );

// Change the variables used by the function that changes the template
add_event_handler('loc_begin_picture', 'copyrights_add_image_vars_to_template');

// Add the prefilter to the template
function copyrights_set_prefilter_add_to_pic_info()
{
        global $template;
        $template->set_prefilter('picture', 'copyrights_add_to_pic_info');
}

// Insert the template for the copyright display
function copyrights_add_to_pic_info($content)
{
        // Add the information after the author - so before the createdate
        $search = '#class="imageInfoTable">#';
        
        $replacement = 'class="imageInfoTable">
        <div id="Copyrights_name" class="imageInfo">
                <dt>{\'Copyright\'|@translate}</dt>
                <dd>
{if $CR_INFO_NAME}
                        <a target="_blanc" href="{$CR_INFO_URL}" title="{$CR_INFO_NAME}: {$CR_INFO_DESCR}">{$CR_INFO_NAME}</a>
{else}
      {\'N/A\'|@translate}
{/if}
    </dd>
        </div>';

        return preg_replace($search, $replacement, $content, 1);
}

// Assign values to the variables in the template
function copyrights_add_image_vars_to_template()
{
        global $page, $template, $prefixeTable;

        // Show block only on the photo page
        if ( !empty($page['image_id']) )
        {
                // Get the copyright name, url and description that belongs to the current media_item
                $query = sprintf('
                  select cr_id, name, url, descr
                  FROM %s NATURAL JOIN %s
                  WHERE media_id = %s
                  AND visible = 1
                ;',
                COPYRIGHTS_ADMIN, COPYRIGHTS_MEDIA, $page['image_id']);
                $result = pwg_query($query);
                $row = pwg_db_fetch_assoc($result);
                $name = '';
                $url = '';
                $descr = '';
                if (isset($row) and count($row) > 0) {
                        // If its the authors default copyright, get the data from the author table, instead of the copyright table
                        if ($row['cr_id'] == -1) {
                                // Check if the extended author plugin is active
                                $query = '
                                        SELECT *
                                        FROM '.$prefixeTable.'plugins
                                        WHERE id=\'Extended_author\'
                                        AND state=\'active\'
                                        ;';
                                $result = pwg_query($query);
                                $row = pwg_db_fetch_assoc($result);
                                
                                // Only get the authors default copyright when it is active.
                                if (count($row) > 0) {
                                        $query = sprintf('
                                                SELECT name, url, descr
                                                FROM %s
                                                WHERE cr_id IN (
                                                        SELECT a.copyright
                                                        FROM '.$prefixeTable.'images i, '.$prefixeTable.'author_extended a
                                                        WHERE i.id = %d
                                                        AND i.author = a.name
                                                )
                                                ;',
                                                COPYRIGHTS_ADMIN, $page['image_id']);
                                        $result = pwg_query($query);
                                        $row = pwg_db_fetch_assoc($result);
                                }
                        }
                }
                // Get the data from the chosen row
                if (isset($row) and count($row) > 0) {
                        $name = $row['name'];
                        $url = $row['url'];
                        $descr = $row['descr'];
                }
                        
                // Sending data to the template
    $template->assign(
      array     (
        'CR_INFO_NAME' => $name,
        'CR_INFO_URL' => $url,
        'CR_INFO_DESCR' => $descr
      )
    );
        }
}

?>