$date=date("y-m-d");
if(mysql_num_rows(mysql_query("SELECT * FROM c WHERE date='$date'"))>0){
$q=mysql_query("UPDATE c SET counter=counter+1 WHERE date='$date'");
}else{
$q=mysql_query("INSERT INTO c (`id`,`counter`,`date`) VALUES('','1','$date') ");
}
$pdate=date("y-m-d",time()-86400);
$q=mysql_query("SELECT * FROM c WHERE date='$date'");
$row=mysql_fetch_array($q);
echo '<div align=right>';
$co=$row['counter'];
echo "بازدید امروز : $co <br>";
$q2=mysql_query("SELECT * FROM c WHERE date='$pdate'");
$row2=mysql_fetch_array($q2);
$co2=$row2['counter'];
echo "بازدید دیروز : $co2";