<?php

$file = @file_get_contents("http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml");

preg_match("#<Cube currency='USD' rate='(.*?)'/>#si", $file, $aktar);

$dolar = $aktar[1];

echo "1 dolar = $dolar TRY";

// çıktı : 1 dolar = 1.4330 TRY

?>