Looking on the internet deeply has found these results:

How are you doing today? is the most popular phrase on the web.

how you doing today? 1371,000 results on the web	How are you doing today? 1401,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
So, how you doing today? Officer Washburn, how you doing today?	How are you doing today, sir? The checkout girl said, "How are you doing today?" And how are you both doing today? How are you doing today, Jack? How are you doing today, ma'am? How are you doing today, Hallelujah?

how you doing today?

1371,000 results on the web

How are you doing today?

1401,000 results on the web

More popular!