致命错误:调用未定义的方法 mysqli::error()

I can connect but when it comes to the prepared statement that is the error i got. anything wrong there?

代码:

    // Open connection
    $db = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE);

    //check connection
    if (mysqli_connect_errno()) {
        printf("Connect failed: %s
", mysqli_connect_error());
        exit();
    }

    // Create statement object
    $stmt = $db->stmt_init();   

    // sql statement
    $sql = "INSERT INTO ch_users ('uid','admin','password','directory','size','format','locationid') VALUES (?, 1, ?, ?, ?, ?, 1)";

    // Create a prepared statement
    $stmt = $db->prepare($sql) or die($db->error());

推荐答案

对于那些偶然发现此页面的人.

Fatal error: Call to undefined method mysqli::error()

if(! empty( $mysqli->error ) ){
   echo $mysqli->error;  // <- this is not a function call error()
}