convert php function to javascript and get the xml contets

i wanna to convert the php function in javascript

below is my code

function getpercentage($standard,$proid,$statename,$repid,$type)

{

$standardids=$standard;

$productid=$proid;

$allstandardsguid=array();

$bencharray=array();

$stddocs = array();

$finalbench=array();

$std = array();

for($g=0;$g<sizeof($standardids);$g++)
{

    $string = file_get_contents("../correlation/standards/".$standardids[$g].".xml");   

    $doc = new DOMDocument();
    $doc->loadXML($string);

    $xpath = new DOMXpath($doc);


    $coursecnt=$xpath->evaluate('count(//itm[@type="course"])');

    $gradecnt=$xpath->evaluate('count(//itm[@type="grade"])');

    if($coursecnt!=0)
    {
    $typ='course';
    }
    else if($gradecnt!=0)
    {
    $typ='grade';
    }
    $grades = $xpath->query("//itm[@type='".$typ."']");

    $guids = $xpath->query("//itm[@type='".$typ."']//itm[@type='standard']/*");


    $stdcnt = 0;
    $h=0;


    foreach($guids as $guid)
    {
        $gud = $guid->getAttribute('guid')."</br>";
        $h++;
    }

    foreach($grades as $grade)
    {
        $nodes = $xpath->query("itm[@type='standard']",$grade);
        $nodecnt = $nodecnt + $nodes->length;

        if($nodes->length > 0) {    
            foreach ($nodes as $node) {

                $guid = $node->getAttribute('guid');
                $nodesinner = $xpath->query(".//itm[@type='standard']",$node);
                $nodecnt = $nodecnt + $nodesinner->length;
                if($nodesinner->length > 0) { 
                    $j=0;
                    foreach ($nodesinner as $nodeinner) {
                        //echo $nodeinner->getAttribute('guid')."</br>";
                        if($nodeinner->getAttribute('guid') != '') {
                            $std[$j] = $nodeinner->getAttribute('guid');
                            $j++;
                            $stdcnt++;
                        }
                    }
                    $stdproduct[$guid] = $std;
                    unset($std);
                } 
                $stdcnt++;
            }
        } 
    } 

    $allstandardsguid[$standardids[$g]]=$stdproduct;
    unset($stdproduct);

    foreach($grades as $grade)
    {
        $nodes = $xpath->query("//itm[@type='standard'][not(descendant::itm[@type='standard'])] ",$grade);
        if($nodes->length > 0) {    
            foreach ($nodes as $node) {
                                    $guid = $node->getAttribute('guid');
                                    $bencharray[] = $guid;
            }
        }
    } 


    $finalbench[]=$bencharray;
    $benchindivdualcount[]=sizeof($bencharray);
    unset($bencharray);
} 




$nodes = $xpath->query("//itm[@type='standard']");
$nodecnt = $nodecnt + $nodes->length;

if($nodes->length > 0) { 
    $j = 0;
    foreach ($nodes as $node) {
        $tempstd[$j] = $node->getAttribute('guid');
        $j++;
    }
}


$productassets=array();         
for($h=0;$h<sizeof($productid);$h++)
{


    $string = file_get_contents("../correlation/products/".$productid[$h].".xml");  
    $stddocs = array();


    $doc = new DOMDocument();
    $doc->loadXML($string);

    $xpath = new DOMXpath($doc);
    $items = $xpath->query("//itm");

    $psalign = array();
    if($items->length > 0) {
        $i = 0;
        foreach($items as $item)
        {
            $guid = $item->getAttribute('guid');
            $psalign[$i] = $guid;
            $i++;
        }
    }
    $productassets[$productid[$h]]=$psalign;
    unset($psalign);
} 





$tempbstdarray = array();
for($k=0;$k<sizeof($standardids);$k++)
{
    $totalalign = 0;
    $tempstdarray = array();
        $mainstdarray = array();
    for($p=0;$p<sizeof($productid);$p++)
    {
        $stdproduct=$allstandardsguid[$standardids[$k]];

        $psalign=$productassets[$productid[$p]];

        foreach($stdproduct as $key => $val) {
            $result = array_intersect($stdproduct[$key],$psalign);
            $tempstdarray = array_merge($tempstdarray, $result);
            if(sizeof($result) > 0) {
                $totalalign++;
                $resultarray[]=array_values($result);
                if(sizeof($stdproduct[$key]) > 0 ) {
                    $mainstdarray[] = $key;
                }
            }
            unset($result);
        }
        unset($stdproduct);
        unset($psalign);    
    } 

    $finalresultarray[]=$resultarray;  
    for($t=0;$t<sizeof($resultarray);$t++)
    {
        for($i=0;$i<sizeof($resultarray[$t]);$i++)
        {
            $newarray[]=$resultarray[$t][$i];
        }
    }

    if(sizeof($newarray)!=0)
    {
        $percent= sizeof(array_unique($tempstdarray)) + sizeof(array_unique($mainstdarray)); 
        $uni=array_values(array_unique($newarray));
        $unipoint=sizeof(array_values(array_unique($newarray)));
    }
    else
    {
        $percent=0;
        $uni=array(0);
        $unipoint=0;
    }

    $percentage[]=$percent;
    $uniquearray[]=$uni;
    $uniquepoints[]=$unipoint;

    unset($newarray);
    unset($resultarray);
    unset($percent);
    unset($uni);
    unset($unipoints);
} 


$tempbmarr = array();
for($benchst=0;$benchst<sizeof($standardids);$benchst++)
{
    $c=0;
    for($pr=0;$pr<sizeof($productid);$pr++)
    {
        $bpsalign=$productassets[$productid[$pr]];

        for($fin=0;$fin<sizeof($finalbench[$benchst]);$fin++)
        {
            $result = array_search($finalbench[$benchst][$fin],$bpsalign);
            if(($result != '') and (!in_array($finalbench[$benchst][$fin],$tempbmarr)))
            {
                $tempbmarr[] = $finalbench[$benchst][$fin];
                $c++;
            }

        }
    }
    $benpercenatge[]=$c;

    unset($benresultarray);
    unset($bpsalign);
    unset($tempbmarr);
}

if($type==1){
    return $percentage;
}
else if($type==2){
    return $benpercenatge;
}
else if($type==3){
    return $benchindivdualcount;
}
else if($type==4){
    return $uniquearray;
}
else if($type==5){
    return $uniquepoints;
}
}