очень нужны коменты по коду PHP

люди добрые может кто нить написать пояснения к коду (типа это переменная, это то то, берется от туда)для курсовой очень надо.

<?php

require ('includes/application_top.php');

// create template elements

$vamTemplate = new vamTemplate;

// include boxes

require (DIR_FS_CATALOG.'templates/'.CURRENT_TEMPLATE.'/source/boxes.php');

// include needed functions

require_once (DIR_FS_INC.'vam_validate_email.inc.php');

if (GROUP_CHECK == 'true') {

$group_check = "and group_ids LIKE '%c_".$_SESSION['customers_status']['customers_status_id']."_group%'";

}

$shop_content_query = vam_db_query("SELECT

content_id,

content_title,

content_group,

content_heading,

content_text,

content_file

FROM ".TABLE_CONTENT_MANAGER."

WHERE content_group='".(int) $_GET['coID']."' ".$group_check."

AND languages_id='".(int) $_SESSION['languages_id']."'");

$shop_content_data = vam_db_fetch_array($shop_content_query);

$shop_content_sub_pages_query = vam_db_query("SELECT

content_id,

content_title,

content_group,

content_heading,

content_text,

content_file

FROM ".TABLE_CONTENT_MANAGER."

WHERE parent_id='" . $shop_content_data['content_id'] . "' ".$group_check."

AND languages_id='".(int) $_SESSION['languages_id']."'");

$sub_pages_content = array();

while ($shop_content_sub_pages_data = vam_db_fetch_array($shop_content_sub_pages_query )) {

$sub_pages_content[]=array(

'PAGE_ID' => $shop_content_sub_pages_data['content_id'],

'PAGE_TITLE' => $shop_content_sub_pages_data['content_title'],

'PAGE_HEADING' => $shop_content_sub_pages_data['content_heading'],

'PAGE_CONTENT' => vam_date_short($one['content_text']),

'PAGE_LINK' => vam_href_link(FILENAME_CONTENT, 'coID='.$shop_content_sub_pages_data['content_group'])

);

}

$vamTemplate->assign('sub_pages_content',$sub_pages_content);

$breadcrumb->add($shop_content_data['content_title'], vam_href_link(FILENAME_CONTENT.'?coID='.(int) $_GET['coID']));

if ($_GET['coID'] != 7) {

require (DIR_WS_INCLUDES.'header.php');

}

if ($_GET['coID'] == 7 && $_GET['action'] == 'success') {

require (DIR_WS_INCLUDES.'header.php');

}

$vamTemplate->assign('CONTENT_HEADING', $shop_content_data['content_heading']);

if ($_GET['coID'] == 7) {

$error = false;

if (isset ($_GET['action']) && ($_GET['action'] == 'send')) {

if (vam_validate_email(trim($_POST['email']))) {

vam_php_mail($_POST['email'], $_POST['name'], CONTACT_US_EMAIL_ADDRESS, CONTACT_US_NAME, CONTACT_US_FORWARDING_STRING, $_POST['email'], $_POST['name'], '', '', CONTACT_US_EMAIL_SUBJECT, nl2br($_POST['message_body']), $_POST['message_body']);

if (!isset ($mail_error)) {

vam_redirect(vam_href_link(FILENAME_CONTENT, 'action=success&coID='.(int) $_GET['coID']));

} else {

$vamTemplate->assign('error_message', $mail_error);

}

} else {

// error report hier einbauen

$vamTemplate->assign('error_message', ERROR_MAIL);

$error = true;

}

}

$vamTemplate->assign('CONTACT_HEADING', $shop_content_data['content_title']);

if (isset ($_GET['action']) && ($_GET['action'] == 'success')) {

$vamTemplate->assign('success', '1');

$vamTemplate->assign('BUTTON_CONTINUE', '<a href="'.vam_href_link(FILENAME_DEFAULT).'">'.vam_image_button('button_continue.gif', IMAGE_BUTTON_CONTINUE).'</a>');

} else {

if ($shop_content_data['content_file'] != '') {

ob_start();

$file_name = basename ($shop_content_data['content_file']);

$isTextFile = strpos($file_name, '.txt');

if ($isTextFile)

echo '';

include (DIR_FS_CATALOG.'media/content/'.$shop_content_data['content_file']);

if ($isTextFile)

echo '';

$contact_content = ob_get_contents();

ob_end_clean();

} else {

$contact_content = $shop_content_data['content_text'];

}

require (DIR_WS_INCLUDES.'header.php');

$vamTemplate->assign('CONTACT_CONTENT', $contact_content);

$vamTemplate->assign('FORM_ACTION', vam_draw_form('contact_us', vam_href_link(FILENAME_CONTENT, 'action=send&coID='.(int) $_GET['coID'])));

$vamTemplate->assign('INPUT_NAME', vam_draw_input_field('name', ($error ? $_POST['name'] : $first_name)));

$vamTemplate->assign('INPUT_EMAIL', vam_draw_input_field('email', ($error ? $_POST['email'] : $email_address)));

$vamTemplate->assign('INPUT_TEXT', vam_draw_textarea_field('message_body', 'soft', 50, 15, $_POST[''],''));

$vamTemplate->assign('BUTTON_SUBMIT', vam_image_submit('button_continue.gif', IMAGE_BUTTON_CONTINUE));

$vamTemplate->assign('FORM_END', '</form>');

}

$vamTemplate->assign('language', $_SESSION['language']);

$vamTemplate->caching = 0;

$main_content = $vamTemplate->fetch(CURRENT_TEMPLATE.'/module/contact_us.html');

} else {

if ($shop_content_data['content_file'] != '') {

ob_start();

$file_name = basename ($shop_content_data['content_file']);

$isTextFile = strpos($file_name, '.txt');

if ($isTextFile)

echo '';

include (DIR_FS_CATALOG.'media/content/'.$shop_content_data['content_file']);

if ($isTextFile)

echo '';

$vamTemplate->assign('file', ob_get_contents());

ob_end_clean();

} else {

$content_body = $shop_content_data['content_text'];

}

$vamTemplate->assign('CONTENT_BODY', $content_body);

$vamTemplate->assign('BUTTON_CONTINUE', '<a href="javascript:history.back(1)">'.vam_image_button('button_back.gif', IMAGE_BUTTON_BACK).'</a>');

$vamTemplate->assign('language', $_SESSION['language']);

// set cache ID

if (!CacheCheck()) {

$vamTemplate->caching = 0;

$main_content = $vamTemplate->fetch(CURRENT_TEMPLATE.'/module/content.html');

} else {

$vamTemplate->caching = 1;

$vamTemplate->cache_lifetime = CACHE_LIFETIME;

$vamTemplate->cache_modified_check = CACHE_CHECK;

$cache_id = $_SESSION['language'].$shop_content_data['content_id'];

$main_content = $vamTemplate->fetch(CURRENT_TEMPLATE.'/module/content.html', $cache_id);

}

}

$vamTemplate->assign('language', $_SESSION['language']);

$vamTemplate->assign('main_content', $main_content);

$vamTemplate->caching = 0;

if (!defined(RM)) $vamTemplate->load_filter('output', 'note');

$template = (file_exists('templates/'.CURRENT_TEMPLATE.'/'.FILENAME_CONTENT.'_'.$_GET['coID'].'.html') ? CURRENT_TEMPLATE.'/'.FILENAME_CONTENT.'_'.$_GET['coID'].'.html' : CURRENT_TEMPLATE.'/index.html');

$vamTemplate->display($template);

include ('includes/application_bottom.php');

?>