28.21. IIS Configuration
If you have a performance-sensitive PHP server deployed on Microsoft IIS under Windows, you should be aware of the different setup options that IIS allows. The different settings allow you to trade reliability and security for performance.
Inside the your PHP application's properties window in Internet Services Manager, select the Home Directory tab. In that tab, you will see an Application Protection pull-down menu, which determines the isolation level of the application. By default, IIS sets it to Medium, which means that PHP pages will be running in a separate process of IIS. In practice, it means that if PHP experiences a crash, perhaps due to memory corruption or stack overflow, the only the PHP-dedicated IIS process ...
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