PHP/MySQL Database/mysqli error

Using mysqli_error() and mysqli_errno()

   <source lang="html4strict">

<?php

    $link = mysqli_connect("hostname", "username", "password", "mydatabase");
    if(!$link) {
       $mysql_error = "Connection error: ".mysqli_connect_error();
         die($mysql_error);    
    }
    $result = mysqli_query($link, "SELECT * FROM foo");
    if(!$result) {
         $errno = mysqli_errno($link);
         $error = mysqli_error($link);
       die("Query Error: $error (code: $errno)");
    }

?>

 </source>