Joke Collection Website - Blessing messages - How does thinkphp get the verification code in the session?

How does thinkphp get the verification code in the session?

The keys corresponding to the verification code array in tp all seem to be like this: D2D977C5844271D9C7 80187E93F80E5.

Therefore, we can directly $ _ session ['d2d977c5844271d9c780187e93f80e5'] ['verify _ code'] to get the value of the verification code.