C3rd

Download the following: (In my case, it's 64bit)

1. PHP
2. Apache
3. Firebird (http://www.firebirdsql.org/en/firebird-2-5-2-upd1/)

After installation of PHP, edit the php.ini and uncomment:

• php_interbase.dll
• php_pdo_firebird.dll

At command prompt, cast php -v and you will have an error:

PHP Warning:  PHP Startup: Unable to load dynamic library 'C:\php\ext\php_interbase.dll' - The specified module could not be found.
 in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library 'C:\php\ext\php_pdo_firebird.dll' - The specified module could not be found.
 in Unknown on line 0
PHP 5.4.9 (cli) (built: Nov 21 2012 19:54:46)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies

Install the Firebird... Try again casting a command php -v

C:\Workspace\localhost\vshbdata>php -v
PHP 5.4.9 (cli) (built: Nov 21 2012 19:54:46)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies

Meaning, the firebird is successfully installed. Second test is create a php script:

<?php

foreach(PDO::getAvailableDrivers() as $driver) {
  echo $driver.'<br />';
}

?>

You should see firebird in the list...