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//Array Sort Function from http://www.zend.com/codex.php?id=501&single=1
//metanurb 
function aasort(&$array, $args) { 
    foreach($args as $arg) { 
        $order_field = substr($arg, 1, strlen($arg)); 
        foreach($array as $array_row) { 
            $sort_array[$order_field][] = $array_row[$order_field]; 
        } 
        $sort_rule .= '$sort_array['.$order_field.'], '.($arg[0] == "+" ? SORT_ASC : SORT_DESC).','; 
    } 
    eval ("array_multisort($sort_rule".' &$array);'); 
}
/*
Syntax: aasort($assoc_array, array("+first_key", "-second_key", etc..)); 

Example: aasort($db_array, array("+ID", "-AGE", "+NAME&quot  ); 
Where the "+" in front of the keys stands for "ASC" and "-" for "DESC". 
*/

function <yourmodulename_userapi_yourfunctioname($args)
{
    // Get arguments from argument array - all arguments to this function
    // should be obtained from the $args array, getting them from other
    // places such as the environment is not allowed, as that makes
    // assumptions that will not hold in future versions of PostNuke
    extract($args);

......

}

......
    // Load API.  All of the actual work for the creation of the new item is
    // done within the API, so we need to load that in before we can do
    // anything.  If the API fails to load an appropriate error message is
    // posted and the function returns
    if (!pnModAPILoad('module', type')) {
        pnSessionSetVar('errormsg', _LOADFAILED);
        return $output->GetOutput();
    }

    // call the apu function
    $mid = pnModAPIFunc('module',
                        'type',
                        'function',
                        array('parameter1' => $paramter1,
                               'parameter2' => $paramter2,
                               etc..... ));
....... 

function <module>_userapi_aasort($args) 
{
    $returnarray = array();
    foreach($args as $arg) {
        $order_field = substr($arg, 1, strlen($arg));
        foreach($array as $array_row) {
            $sort_array[$order_field][] = $array_row[$order_field];
        }
        $sort_rule .= '$sort_array['.$order_field.'], '.($arg[0] == "+" ? SORT_ASC : SORT_DESC).',';
    }
    eval ("array_multisort($sort_rule".' $returnarray);');

    return $returnarray;
}

$returnarray = pnModAPIFunc('Wdpool', 
                        'user', 
                        'aasort', 
                        array('array' => $fortiebreaking, 
                               'args' => $sortbys));

$sortbys=array("-field1", "+field5");

    // call the apu function 
    $returnarray = pnModAPIFunc('modname', 
                        'user', 
                        'aasort', 
                        array('array' => $arraytosort, 
                               'args' => $sortbys));

function modname_userapi_aasort($args) 
{ 
extract($args);
    $returnarray = $array; 
    foreach($args as $arg) { 
        $order_field = substr($arg, 1, strlen($arg)); 
        foreach($array as $array_row) { 
            $sort_array[$order_field][] = $array_row[$order_field]; 
        } 
        $sort_rule .= '$sort_array['.$order_field.'], '.($arg[0] == "+" ? SORT_ASC : SORT_DESC).','; 
    } 
  //  eval ("array_multisort($sort_rule".' $returnarray);'); 
eval ("array_multisort($sort_rule".' &$returnarray);'); 
    return $returnarray; 
}