Back To PHP PDO MySql

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<?php //php program to display records from a table $hostname = 'localhost'; $username = 'root'; $password = ''; try { $dbh = new PDO("mysql:host=$hostname;dbname=students", $username, $password); print 'Connected to database<br />'; $sql = "SELECT * FROM student"; foreach ($dbh->query($sql) as $row) { print $row['rollno'] .' - '. $row['name'] .' - '. $row['class'] . ' - '. $row['marks'] .'<br />'; } $dbh = null; } catch(PDOException $e) { print($e->getMessage()); } ?>