What potential issues can arise when using PHP with IIS?

One potential issue when using PHP with IIS is that the PHP handler may not be properly configured, leading to PHP scripts not being executed correctly. To solve this issue, you can manually configure the PHP handler in the IIS Manager by mapping the PHP file extension to the PHP FastCGI module. 

<configuration>
  <system.webServer>
    <handlers>
      <add name="PHP_via_FastCGI" path="*.php" verb="GET,POST,HEAD" modules="FastCgiModule" scriptProcessor="C:\path\to\php-cgi.exe" resourceType="File" requireAccess="Script" />
    </handlers>
  </system.webServer>
</configuration>

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