"All of a sudden" vs. "all of the sudden" [closed]

According to Google (63 million results), it should be all of the sudden, though, 22 million results say otherwise, which one is correct?

Solution 1:

"All of a sudden" is the idiom. I rationalize that there is no particular sudden, so it has to be a sudden.

Brians Common Errors backs me up here, although idioms don't necessarily follow the rules of grammar anyway.

Solution 2:

Each one of those 63 million results says that all of the sudden doesn't really make any sense.

The idiom

All of a sudden : very quickly and unexpectedly, suddenly.

A sample sentence would be

I felt a sharp pain in my side all of a sudden.

Solution 3:

I find this:

If we go back beyond Shakespeare the variant 'the sudden' was commonplace; for example, ...

in PHRASES.ORG.UK