Question : Php 500 internal server error received on website but not using xampp at home

I have the same php file on my computer as on the web server, and it loads fine using xampp. However, when trying to load the file on my website, I get a 500 internal server error with a 404 error as well. I wrote to my web host and they said to change my file permissions to  folders have the permission of 755 and the files a permission of 644. They already do. What should I do?

Answer : Php 500 internal server error received on website but not using xampp at home

Thanks. The hosting service solved the problem, although they did not say what they did.