function kurver($id,$bip){    
$xml= simplexml_load_file('http://www.tcmb.gov.tr/kurlar/today.xml');
foreach ($xml->Currency as $Currency) {
if ($Currency['Kod']=="$id"){
if ($id==USD && $bip==AL){    
$para=$Currency->ForexBuying;
}elseif ($id==USD && $bip==SAT){
$para=$Currency->ForexSelling;
}elseif ($id==EUR && $bip==AL){
$para=$Currency->ForexBuying;
}elseif ($id==EUR && $bip==SAT){
$para=$Currency->ForexSelling;
}}} 
return $para;
}

$k1 = kurver(USD,'SAT');