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Other Functions

Here are a few other helpful function that aren't related to the previous sections.

A temporary storage mechanism for individual values.
Display a "CAPTCHA" in your form to help fight spam.
Deletes old, unwanted, unfinalized submissions in the database.
A handy function to check to see if a submission is unique or not. The "uniqueness" can be based on whatever criteria you want - email address, email address and password, user name, etc.
This displays an appropriate error message if the user fails to enter the CAPTCHA properly.