<?php
/*** mysql hostname ***/
$hostname = 'localhost';

/*** mysql username ***/
$username = 'root';

/*** mysql password ***/
$password = 'root';

try {
    $dbh = new PDO("mysql:host=$hostname;dbname=pdo", $username, $password);
    /*** echo a message saying we have connected ***/
    echo 'Connected to database<br />';

    /*** The SQL SELECT statement ***/
    $sql = "SELECT * FROM animals";

    /*** fetch into an PDOStatement object ***/
    $stmt = $dbh->query($sql);

    /*** echo number of columns ***/
    $result = $stmt->fetch(PDO::FETCH_ASSOC);

    /*** loop over the object directly ***/
    foreach($result as $key=>$val)
    {
    echo $key.' - '.$val.'<br />';
    }

    /*** close the database connection ***/
    $dbh = null;
}
catch(PDOException $e)
    {
    echo $e->getMessage();
    }
?>