I would like to mention fetching rows from SQL query using PDO:

<?php

$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass);

// use the connection here
$sth = $dbh->query('SELECT * FROM countries');

// fetch all rows into array, by default PDO::FETCH_BOTH is used
$rows = $stm->fetchAll();

// iterate over array by index and by name
foreach($rows as $row) {

    printf("$row[0] $row[1] $row[2]\n");
    printf("$row['id'] $row['name'] $row['population']\n");

}
?>