$arr1=[];

$sqlquery="Select codart,canped,codpro
           from gcpedl
           where gcpedl.numped in (
                                   select numped
                                   from gcpedc
                                   where texto like '".$_POST['codobra']."'
                                   )";
$query_execute = mssql_query($sqlquery);

while($query_result=mssql_fetch_array($query_execute)){
    $arr1=$query_result;
    $sqlq="Select distinct alart.codart,pultcomp,alart.codpro from alart,gcpedl where gcpedl.numped in (select numped from gcpedc where texto like '".$_POST['codobra']."') and alart.codart in (Select codart from gcpedl where numped in (select numped from gcpedc where texto like '".$_POST['codobra']."')) ";
    $sqlex =mssql_query($sqlq);

    while($sqlre=mssql_fetch_array($sqlex)){
        if (    trim(strtoUPPER($sqlre['codart'])," ")==trim(strtoUPPER($query_result['codart'])," ")
            and $sqlre['codpro']==$query_result['codpro'] )
        {
            if (    $arr1['codart'] != 'CUADRO'
                and $arr1['codart'] != 'cuadro'
                and $arr1['codart'] != 'instalacion'
                and $arr1['codart'] != 'INSTALACION')
            {
                $materiales= $materiales+ ($sqlre['pultcomp']*$arr1['canped']);
            }
        }
    }