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sending a session variable from one page to another involves - having a working, error free, session_start() statement on both pages; have a server properly setup with a folder to hold the session data files; have the session cookie parameters setup so that they match the url for both pages; assign a value to a session variable on one page, that you are sure isn't getting cleared after you have set it, and test for and use the session variable on the second page. except for very overt symptoms, there is not a 'one symptom' is always caused by 'one thing' relationship in programming. if you are expecting someone here to be able to directly tell you what the cause of this problem is, you are mistaken. there are too many possibilities. when something in programming doesn't work, you must find where your code and data are doing what you expect and where they are not. the problem lies between those two points. if all you have done is run your code and notice that the output doesn't exist, you haven't narrowed down the problem. the first step in narrowing down a programming problem is finding any errors that the language is reporting. to do this, you must setup the error related settings and verify that they are actually the values that you have set them to. in your last thread, you would have been getting a fatal run-time error to alert you to one of the problems in the code, but you didn't indicate you were getting any errors. this means that php's error related settings (error_reporting, display_errors, and log_errors) are not setup so that php will help you. once you have set the error settings as i stated, and comment out the redirect, this will narrow down the possibilities, by either producing a error pointing to a problem or if doesn't produce an error this points to where to look at next.

you should do this directly in the sql query statement. MySql has a large number of datetime functions. what is the format of the 'date' column in the database table? if you do this in the php code, you must either compare objects with objects or compare formatted strings with formatted strings, with the same exact format, in a left-right order from most significant field (year) to least significant field (day.) the current php code produces a fatal error at the date_diff() method call, because the 2nd argument must be an object, not the $data["date"] string. $date is a datetime object, you cannot directly compare it with the $data["date"] string. you either must use the datetime ->format() method to produce a formatted string from the $date object, or you must create a datetime object from the $data["date"] string. $diff in a dateinterval object. to get the number of days, you would need to use the dateinterval ->format() method with the '%a' format specifier to produce the whole number of days.