不能在$ db_connect-> select_db（$ name）上引发错误; ？ PHP

Question

I am a student.

I'm trying to deliberately induce an error in

$db_connect->select_db($db_name); 

to check the error handling, but it won't give out an error?

The actual database name is 'cart', but i am using 'cartxx' to try and induce an error, but nothing happens, it runs as if there is no error. I don't have a database named 'cartxx'.

<?php

session_start();

$host = 'localhost'; // connects to the host server

$db_name = 'cartxx'; // name of the database we are connecting to
$db_username = 'root'; // username for database
$db_password = ''; // password for database

$db_connect = new mysqli($host, $db_username, $db_password); // connect to mysql



// If error
if (mysqli_connect_errno()) {
    echo('Connection to database failed: ' . mysqli_connect_error());
    exit();
}


// Select database
$db_connect->select_db($db_name);


// If error
if (mysqli_connect_errno()) {
    echo 'Connection to database {$db_name} has failed: '  . mysqli_connect_error();
    exit();
}

Thanks.

Answer 1

you need to pass default db name in connection string directly. if you need connect to one more database you can use select statment

$db_connect = new mysqli($host, $db_username, $db_password, $db_name); 

for more :- http://php.net/manual/en/function.mysqli-connect.php