php - Alternative for mysql_num_rows using PDO

Question

Right now I have a PHP file that does a MYSQL query and then counts rows like this:

$count=mysql_num_rows($result);


if ($count == 1) {
    $message = array('status' => 'ok');
} else {
    $message = array('status' => 'error');
}

This works fine but I'm trying to change all my PHP files to use PDO. So how can this be done with PDO?

Answer 1

$res = $DB->query('SELECT COUNT(*) FROM table');
$num_rows = $res->fetchColumn();

or

$res = $DB->prepare('SELECT COUNT(*) FROM table');
$res->execute();
$num_rows = $res->fetchColumn();

You can use this to ask if data exists or is selected, too:

$res = $DB->query('SELECT COUNT(*) FROM table');
$data_exists = ($res->fetchColumn() > 0) ? true : false;

Or with your variables:

$res = $DB->query('SELECT COUNT(*) FROM table');
$message = ($res->fetchColumn() > 0) ? array('status' => 'ok') : array('status' => 'error');