如何创建301重定向到HTTPS的.htaccess文件，将URL末尾的斜杠重定向到非并删除.php而不会发生冲突？

I have been trying for hours now to create this .htaccess file without luck.

I have redeveloped my site and my SEO is a bit all over the place. For Google's and my users' sake, I need a .htaccess file that:

• Redirects http://example.com/* to https://example.com/*
• Redirects *.example.com/*.php to https://example.com/*
• Redirects *.example.com/*/ to https://example.com/*

So to clarify, forces SSL, removes trailing slashes and .php extensions in a Google friendly (301-redirect) way. Or any combination of the above.