I put up an HTML page that allows a user to modify some previously entered information. The information is taken from a MySQL database and displayed on the page. The user can leave the data alone or modify it. If there is no information in the database for one of the fields, the input box is empty. The problem is that when I submit this information, the page that is called does not receive the variables from fields with no information as "null". Instead, it gets them with something other than null, although if I print the variable, they come out blank. I check the variable using "is_null" and they evaluate as not being null. When my script then enters the information into the MySQL database, a value of "0" is entered for the numeric fields. Having these "0" values in the database gives me the wrong information. Any idea why an input field that is populated with a null value would go to the next page as a not null value (although no value shows up for it until it is written to the database)?
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