mysql_connect always allows access - php

Question

I am attempting to connect to a mySQL database running on my local computer using a local test server set up using XAMPP. I am just using the root account which has no password assigned. I tried it as below and everything appears to work fine. I got my message echoed out to say I had successfully connected. I then tried to force an error by entering anything else in as the host, username or password and it still echoes "connection successful".
This is the code I am using to connect:
<?php
$db_host = "localhost";
$db_username = "root";
$db_password = "";
$myConn = mysql_connect($db_host, $db_username, $db_password) or die('Connection error: '.mysql_error());
echo 'connection successful';
?>
I was wondering whether it is me or maybe the install of apache/mySQL that I am using that is causing such an absurdity.

Answer 1

Something must be screwed up with your install:
marc#panic:~$ php -a
php > $x = mysql_connect('bleargh', 'foo', 'bar') or die(mysql_error());
PHP Warning: mysql_connect(): Unknown MySQL server host 'bleargh' (2) in php shell code on line 1
Unknown MySQL server host 'bleargh' (2)marc#panic:~$
About all I can think of is you've got a DNS server that returns a valid address for ALL lookups, causing all hostnames to resolve.

Answer 2

try this one
$db_host = "localhost";
$db_username = "root";
$db_password = "";
$con = mysql_connect($db_host,$db_username,$db_passwd);
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
else
echo 'connection successful';
mysql_close($con);
?>

Answer 3

It will always echo 'connection successful' because you aren't checking the status of the connection.
if (!$myConn) {
echo 'Sorry, there was an error '.mysql_error();
} else {
echo 'connection successful';
}
Depending on how you executed the code, you might be running into this:
If a second call is made to mysql_connect() with the same arguments,
no new link will be established, but instead, the link identifier of
the already opened link will be returned. The new_link parameter
modifies this behavior and makes mysql_connect() always open a new
link, even if mysql_connect() was called before with the same
parameters. In SQL safe mode, this parameter is ignored.
So, either do an explicit check or:
$myConn = mysql_connect($db_host, $db_username, $db_password, true) or die('Connection error: '.mysql_error());