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Получаем разделы и вложенные подразделы в иерархическом виде:

[CODE]<?php

function getSectionList($filter, $select)
{
$dbSection = CIBlockSection::GetList(
Array(
        'LEFT_MARGIN' => 'ASC',
),
array_merge(
Array(
'ACTIVE' => 'Y',
'GLOBAL_ACTIVE' => 'Y'
),
is_array($filter) ? $filter : Array()
),
false,
array_merge(
Array(
'ID',
'IBLOCK_SECTION_ID'
),
is_array($select) ? $select : Array()
)
);

while( $arSection = $dbSection-> GetNext(true, false) ){

   $SID = $arSection['ID'];
   $PSID = (int) $arSection['IBLOCK_SECTION_ID'];

   $arLincs[$PSID]['CHILDS'][$SID] = $arSection;

   $arLincs[$SID] = &$arLincs[$PSID]['CHILDS'][$SID];
}

return array_shift($arLincs);
}  

?>[/CODE]
Пример использования:

[CODE]<?php

$arSections = getSectionList(
Array(
'IBLOCK_ID' => 25
),
Array(
'NAME',
'SECTION_PAGE_URL'
)
);

echo "<pre>";
var_dump($arSections);
echo "</pre>";  

?>[/CODE]

[QUOTE]
<?
require_once($_SERVER['DOCUMENT_ROOT'].BX_ROOT.'/modules/main/interface/admin_lib.php');
define('ADMIN_THEME_ID', '.default');
?>

<form action="<?=$APPLICATION->GetCurPage()?>" method="POST" name="form1">
<?echo CalendarPeriod("date_from", "25.10.2003", "date_to", "29.10.2003", "form1", "Y")?>
</form>
[/QUOTE]