Uncaught Pdoexception error: could not find driver

Question

I’m trying to connect the sql server with php7, insert the database data into the php class, insert the extensions into the php folder in xamp, and in php.ini, but this error appears when I run the code.

My Code

$conn = new PDO ("sqlsrv:Database=dbphpsql;server=localhost\SQLEXPRESS; ConnectionPooling=0", "sa", "root");

$stmt = $conn->prepare("SELECT * FROM tb_usuarios ORDER BY deslogin");

$stmt ->execute();

$results = $stmt ->fetchAll(PDO::FETCH_ASSOC);

foreach ($results as $row) {

    foreach ($row as $key => $value) {

        echo "<strong>" . $key . ":</strong>" . $value . "<br/>";

    }

    echo "====================================================<br>";

}

var_dump($results) . "<br>";