RewCount (): Returns the number of rows affected:
$sql='select * from '.$_POST['fname'].'_blog_data';
$sth=$pdo->query($sql);
die('<script>alert('.$sth->rowCount().')</script>');
2
$q = $pdo->query("SELECT count(*) from w_login_record;"); $rows = $q->fetch(); $rowCount = $rows[0];
die('alter("'.$rowCount.'")');
3
Use the fetchAll function $q = $db->query("SELECT ..."); $rows = $q->fetchAll(); $rowCount = count($rows);