PHP Fatal error: Call to undefined function mssql_connect()

I have just tried to install that extension on my dev server.

First, make sure that the extension is correctly enabled. Your phpinfo() output doesn't seem complete.

If it is indeed installed properly, your phpinfo() should have a section that looks like this:

If you do not get that section in your phpinfo(). Make sure that you are using the right version. There are both non-thread-safe and thread-safe versions of the extension.

Finally, check your extension_dir setting. By default it's this: extension_dir = "ext", for most of the time it works fine, but if it doesn't try: extension_dir = "C:PHPext".

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EDIT given new info:

You are using the wrong function. mssql_connect() is part of the Mssql extension. You are using microsoft's extension, so use sqlsrv_connect(), for the API for the microsoft driver, look at SQLSRV_Help.chm which should be extracted to your ext directory when you extracted the extension.

Microsoft SQL Server support and extensions are not shipped with PHP anymore. To connect PHP with SQL Server you need Microsoft Drivers for PHP for SQL Server:

The Microsoft Drivers for PHP for SQL Server is a PHP 5 extension that provides data access to SQL Server 2005 and later versions including SQL Azure.

The download page for drivers lists four versions to choose from. Consult the System Requirements page in order to determine which version you need. You must install the correct driver for your Operating System+SQL Server+PHP version combination.

You will also need one of these depending on which driver you choose (these must be installed separately):

• SQL Server Native Client
• Microsoft ODBC Driver 11 for SQL Server

The installer simply extracts the files in the specified location. You must the files to PHP extensions directory. The files are PHP extensions. The file names indicate:

• nts/ts -- should be used with non thread safe/thread safe version of PHP
• 54/55/56... -- should be used with PHP version 5.4, 5.5, 5.6, ...
• sqlsrv/pdo_sqlsrv -- provides procedural interface/PDO interface

Enable the extensions in php.ini file making sure that thread safetyness and PHP versions match.

Check phpinfo to see if extensions are loaded. Test sqlsrv_connect("servername") and new PDO("sqlsrv:server=servername") to make sure the extensions are working.

As you've rightly pointed out, support for the community mssql driver is not compiled into the latest Windows PHP binaries.

Presently the current stable release of MDB2 (2.4.1) does not support the official Microsoft sqlsrv native driver.

However if you're willing to live on the edge a bit with the beta release of MDB2 then all is not lost. There is a Microsoft native sqlsrv driver that is part of the 2.5.0b3 release:

http://pear.php.net/package/MDB2_Driver_sqlsrv

First of all ensure that you've installed the Microsoft native driver as I described in my answer here:

Connection between MSSQL and PHP 5.3.5 on IIS is not working

Then to install the PEAR MDB2 sqlsrv driver do the following:

1. If you've already installed MDB2 then uninstall it:

   pear uninstall mdb2

   If you already have any drivers installed then you'll need to uninstall these first:

   pear uninstall mdb2#mysql

2. Next tell PEAR that you want to allow non-stable beta packages:

   pear config-set preferred_state beta

3. Install MDB2_Driver_sqlsrv

   pear install MDB2_Driver_sqlsrv

   This will install the latest MDB2 beta and the MS sqlsrv driver:

   downloading MDB2_Driver_sqlsrv-1.5.0b3.tgz ...
   Starting to download MDB2_Driver_sqlsrv-1.5.0b3.tgz (29,468 bytes)
   .........done: 29,468 bytes
   downloading MDB2-2.5.0b3.tgz ...
   Starting to download MDB2-2.5.0b3.tgz (130,865 bytes)
   ...done: 130,865 bytes
   install ok: channel://pear.php.net/MDB2_Driver_sqlsrv-1.5.0b3
   install ok: channel://pear.php.net/MDB2-2.5.0b3
   MDB2: Optional feature fbsql available (Frontbase SQL driver for MDB2)
   MDB2: Optional feature ibase available (Interbase/Firebird driver for MDB2)
   MDB2: Optional feature mssql available (MS SQL Server driver for MDB2)
   MDB2: Optional feature mysql available (MySQL driver for MDB2)
   MDB2: Optional feature mysqli available (MySQLi driver for MDB2)
   MDB2: Optional feature oci8 available (Oracle driver for MDB2)
   MDB2: Optional feature odbc available (ODBC driver for MDB2)
   MDB2: Optional feature pgsql available (PostgreSQL driver for MDB2)
   MDB2: Optional feature querysim available (Querysim driver for MDB2)
   MDB2: Optional feature sqlite available (SQLite2 driver for MDB2)
   MDB2: Optional feature sqlsrv available (MS SQL Server driver for MDB2)
   MDB2: To install optional features use "pear install pear/MDB2#featurename"
   

4. It's probably advisable to knock PEAR back to only allowing stable packages again

   pear config-set preferred_state stable

I just tried this with the following test script and I was able to connect to my local MS SQL Server and retrieve some data:

<?php
require_once 'MDB2.php';

$dsn = array(
    'phptype'  => 'sqlsrv',
    'username' => 'test',
    'password' => 'testpass',
    'hostspec' => 'localhost',
    'database' => 'PEARMDBTEST',
);

$mdb2 =& MDB2::connect($dsn);

if(PEAR::isError($mdb2)) 
{
    die($mdb2->getMessage());
}

$res =& $mdb2->query('SELECT * FROM TestData');

while (($row = $res->fetchRow())) {
    echo $row['TestDataRow'] . "<br/>";
}

?>