PHP v5.4 and Class 'mysqli' not found error

Hello folks,

   I upgraded to Web Expressions 4 from Web Matrix 3. I also upgraded my PHP from v5.3 to v5.4.
I checked in the applications option to ensure it had the right path for the php and it does.
But when I try to execute my page this is what I receive:

Fatal error: Class 'mysqli' not found in C:\Users\laptop\Documents\My Web Sites\SuppliersPHP\agentlogon.php on line 18

So I looked it up and mysqli should still be valid.
The web pages worked fine under PHP v5.3 in Web Matrix 3.
But I need to have Web Expression 4 working properly as its time to retire Web Matrix 3.
Can someone tell me what is wrong and how to fix it?
I really need PHP 5.4 and Web Expressions to work properly.
I also found a snippet of coding that test to see if mysqli is installed and it returns that it is not!
How can that be when I successfully used with PHP v5.3 in Web Matrix 3?

I have also included the entire section
    require_once ("Includes/dbconfig.php");
    $baderr= "";

    if (isset($_POST['cancel']))
           header ("Location: goodbye.php");

    if (isset($_POST['submit']))
           $username = $_POST['username'];
           $password = $_POST['password'];

        // create database connection
        $databaseConnection = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
        if ($databaseConnection->connect_error)
            die("Database selection failed: " . $databaseConnection->connect_error);


             $query = "SELECT * FROM agents WHERE AgentUserName = '$username' AND AgentPassword = '$password'";

             $result = $databaseConnection->query($query);

            if ($result->num_rows > 0)
              // output data
                while($row = $result->fetch_assoc())
                      //set up global session vars to be used thru out pages
                        $_SESSION["UserType"] ="A";
                        $_SESSION["AgentRecId"] = $row["RecId"];
                        $_SESSION["MsSqlAgentId"] = $row["AgentIdPk"];
                        $_SESSION["AgentFirstName"] = $row["FirstName"];
                        $_SESSION["AgentLastName"] = $row["LastName"];
                        $_SESSION["AgencyName"] = $row["AgencyName"];
                        $_SESSION["AgentEmail"] = $row["EmailAddress"];
                     // close database connection and redirect to agents menu
                        header ("Location: agentmenu.php");
           } else {
               $baderr = "Username/password combination is incorrect. Please try again";

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of coding below:
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Dan CraciunIT ConsultantCommented:
Check in php.ini for a line containing:
or in Windows:

If it's commented out, remove the ;, then restart your web server.

OverthereAuthor Commented:
I had checked the php.ini and removed the ; then restarted my IIS. I even rebooted. I am now receiving " PHP startup: Unable to load dynamic library c:\php\php_mysqli.dll"
I don't even have a file folder on c as PHP!

I made sure in Web Expression 4 that the application and site path for php was correct.
Its installed in C:\Program Files (x86)\php-5.4.45\php-cgi.exe

I then changed the php.ini - first to inserting the entire path and that resulted in it phewing.
And then uncommented to just:  extension=php_mysqli.dll
Still phews.

 What now?

I don't even have a file folder on c called "php"
Dan CraciunIT ConsultantCommented:
Search for "php_mysqli.dll" on your computer.
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OverthereAuthor Commented:
here's what worked.
1. dragged my PHP folder to root (c:\)
2.adjusted my application and site options to that path
3. rechecked my php.ini

the error for mysqli.dll has disappeared but it is slower than a turtle. It was much,much faster in web Matrix 3. In addition, it now can not find pages. And the coding on pages are having a problem finding other pages. I use this:  
Any ideas on that one? this is discouraging.. I also noticed that when I create a website in web Expression, it does not appear in IIS 7 - why is that?
header("Location: agentmenu.php");

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OverthereAuthor Commented:
Here's what I did - I uninstall web Expression4. Reverted back to Web Matrix 3.
Made sure that in the file that any reference in the extensions section for mysqli.dll, including pdo , was unchecked. Works better but still can get their examples to work. My previos sites that used php 5.3 work fine now too.
What gives?
Ray PaseurCommented:
Some things changed between PHP 5.3 and PHP 5.4.  This article explains a bit of what you need to know.

Also, PHP 5.6+ is current and PHP 7 is only days away.  So running PHP 5.3 in 2015 is so out-of-date that it's asking for trouble these days.  Time to upgrade!

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OverthereAuthor Commented:
I agree. I upgraded to 5.4 and depending on the components I am going to be using, I may upgrade to 5.6. Most of what I wrote in 5.3 was for demos and for myself as learning experience.
I did some more digging using IE and Chrome debugging options and it all points to the MySQL drivers. Haven't made a decision yet as to what I will do. I don't like MS Web Expression 4 - its buggy in my option. And Web Matrix 3 only supports  up PHP v5.5 - so I am kinda in a bind on that issue.
I like to be able to "preview" what the web page will render as a result of my PHP coding and as you know - some web developing packages don't handle that very well. Any suggestions?

Thank you again Ray for pointing me in the right path.
Ray PaseurCommented:
Check into Bitnami - they offer some virtual machine images that you can install on localhost.  I think you need a VMWare instance, but you can probably get that for free.
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