The premise is that your iis has been installed successfully and your php installation package has been downloaded.
As for the installation of iis, you can find a Windows xp disk, and the php installation package can be downloaded from www.php.com.
1. Unzip the software package to c:php5
2. Then copy all the dll files in the directory to c:winntsystem32. Do not overwrite the existing dll files; then copy the two files php.exe and php.ini-dist in the directory to c:winnt. Next
3. Rename c:winntphp.ini-dist to php.ini
4. Open "Programs" => "Management Tools" => "Internet Service Manager" under the "Start" button. Next, select the "Home Directory" page, click the "Configure" button under "Application Settings", click the "Add" button in the new window; enter "C:WINNTphp.exe %" in "Executable File" s %s", enter ".php" in "Extension", and click "OK".
5. Next, select the "ISAPI Filter" page and click the "Add" button; enter "php" in the "Filter Name" and "C:WINNTsystem32php5isapi.dll" in the "Executable File". Click OK.
6. Select the "Document" page, click the "Add" button; enter "index.php" in the "Default Document Name", click "OK", and raise it to the highest level. You can also add commonly used PHP file names, such as: "default.phtml", "index.php3", etc.
Close all windows and restart the system, then open the IE browser for testing.