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General considerations for all installations of PHP with IIS

• First, read the Manual Installation Instructions. Do not skip this step as it provides crucial information for installing PHP on Windows.
• CGI users must set the cgi.force_redirect PHP directive to 0 inside php.ini. Read the faq on cgi.force_redirect for important details. Also, CGI users may want to set the cgi.redirect_status_env directive. When using directives, be sure these directives aren't commented out inside php.ini.
• The PHP 4 CGI is named php.exe while in PHP 5 it's php-cgi.exe. In PHP 5, php.exe is the CLI, and not the CGI.
• Modify the Windows PATH environment variable to include the PHP directory. This way the PHP DLL files and PHP executables can all remain in the PHP directory without cluttering up the Windows system directory. For more details, see the FAQ on Setting the PATH.
• The IIS user (usually IUSR_MACHINENAME) needs permission to read various files and directories, such as php.ini, docroot, and the session tmp directory.
• Be sure the extension_dir and doc_root PHP directives are appropriately set in php.ini. These directives depend on the system that PHP is being installed on. In PHP 4, the extension_dir is extensions while with PHP 5 it's ext. So, an example PHP 5 extensions_dir value is "c:\php\ext" and an example IIS doc_root value is "c:\Inetpub\wwwroot".
• PHP extension DLL files, such as php_mysql.dll and php_curl.dll, are found in the zip package of the PHP download (not the PHP installer). In PHP 5, many extensions are part of PECL and can be downloaded in the "Collection of PECL modules" package. Files such as php_zip.dll and php_ssh2.dll. » Download PHP files here.
• When defining the executable, the 'check that file exists' box may also be checked. For a small performance penalty, the IIS will check that the script file exists and sort out authentication before firing up PHP. This means that the web server will provide sensible 404 style error messages instead of CGI errors complaining that PHP did not output any data.
• The PHP executable is distributed as a 32bit application. If you are running a 64bit version of Windows you will either need to rebuild the binary yourself, or make sure IIS is configured to also run 32bit extensions. You can usually turn this on by using the IIS Administration script as follows: Cscript.exe adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1

Windows NT/200x/XP and IIS 4 or newer

PHP may be installed as a CGI binary, or with the ISAPI module. In either case, you need to start the Microsoft Management Console (may appear as 'Internet Services Manager', either in your Windows NT 4.0 Option Pack branch or the Control Panel=>Administrative Tools under Windows 2000/XP). Then right click on your Web server node (this will most probably appear as 'Default Web Server'), and select 'Properties'.

If you want to use the CGI binary, do the following:

• Under 'Home Directory', 'Virtual Directory', or 'Directory', do the following:
• Change the Execute Permissions to 'Scripts only'
• Click on the 'Configuration' button, and choose the Application Mappings tab. Click Add and set the Executable path to the appropriate CGI file. An example PHP 5 value is: C:\php\php-cgi.exe Supply .php as the extension. Leave 'Method exclusions' blank, and check the 'Script engine' checkbox. Now, click OK a few times.
• Set up the appropriate security. (This is done in Internet Service Manager), and if your NT Server uses NTFS file system, add execute rights for I_USR_ to the directory that contains php.exe / php-cgi.exe.

To use the ISAPI module, do the following:

• If you don't want to perform HTTP Authentication using PHP, you can (and should) skip this step. Under ISAPI Filters, add a new ISAPI filter. Use PHP as the filter name, and supply a path to the php4isapi.dll / php5isapi.dll.
• Under 'Home Directory', 'Virtual Directory', or 'Directory', do the following:
• Change the Execute Permissions to 'Scripts only'
• Click on the 'Configuration' button, and choose the Application Mappings tab. Click Add and set the Executable path to the appropriate ISAPI DLL. An example PHP 5 value is: C:\php\php5isapi.dll Supply .php as the extension. Leave 'Method exclusions' blank, and check the 'Script engine' checkbox. Now, click OK a few times.
• Stop IIS completely (NET STOP iisadmin)
• Start IIS again (NET START w3svc)

With IIS 6 (2003 Server), open up the IIS Manager, go to Web Service Extensions, choose "Add a new Web service extension", enter in a name such as PHP, choose the Add button and for the value browse to either the ISAPI file (php4isapi.dll or php5isapi.dll) or CGI (php.exe or php-cgi.exe) then check "Set extension status to Allowed" and click OK.

In order to use index.php as a default content page, do the following: From within the Documents tab, choose Add. Type in index.php and click OK. Adjust the order by choosing Move Up or Move Down. This is similar to setting DirectoryIndex with Apache.

The steps above must be repeated for each extension that is to be associated with PHP scripts. .php is the most common although .php3 may be required for legacy applications.

If you experience 100% CPU usage after some time, turn off the IIS setting Cache ISAPI Application.