$myFile1 = "adres1.txt";
$fh = fopen($myFile1, 'r');
$theData1 = fread($fh, filesize($myFile1));
fclose($fh);

$myFile2 = "adres2.txt";
$fh = fopen($myFile2, 'r');
$theData2 = fread($fh, filesize($myFile2));
fclose($fh);

echo 'Toplam'.($theData1+$theData2).' defa indirildi';