Código PHP:
$link = mysql_connect($host, $user, $pass);
mysql_select_db( $database, $link );
$query = "SELECT * FROM Clientes";
$result = mysql_query( $query, $link ) or die( mysql_error() );
while( $row = mysql_fetch_array( $result ) ) {
print_r( $row );
}
mysql_free_result( $result );
mysql_close( $link );