mysql 连接失败语句不起作用

Question

I'm trying to check the connection with MySQL databse using the following code:

<?php
define('DBHOST','localhost');
define('DBUSER','root');
define('DBPASS','');
define('DBNAME','ts');


$link = mysqli_connect(DBHOST,DBUSER,DBPASS,DBNAME);

    if($link === false){
      header('Location: dberror.php');
    }else {
      echo "connected successfully";
    }

?>

When I try to give incorrect information to test the statement if the connection is not established like giving an incorrect database name, the header is not working and shows the following error:

Fatal error: Uncaught mysqli_sql_exception: Unknown database 'ts' in C:\xampp\htdocs\tst\dbcon.php:8 Stack trace: #0 C:\xampp\htdocs\tst\dbcon.php(8): mysqli_connect('localhost', 'root', '', 'ts') #1 {main} thrown in C:\xampp\htdocs\tst\dbcon.php on line 8

But when the connection is established the else statement is working.

So please how to make a user redirection if the connection failed?

Answer 1

Return values for mysqli_connect() are an object or false . It only returns false if the connection fails. Try var_dump the result of mysqli_connect() to see if you're getting an object . Remember the database field is optional because it can be selected later using mysqli_select_db() , so even if that's empty you will still get an object .

Once the connection is made you can see errors using mysqli_error() .