mysql - PHP Display hours until a certain event from a time given -

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so basically, wanted happen was, wanted submit article submits current time() , amount of hours until event. wished calculate amount of time in hours time() in database amount of hours since article posted. if posted article event happening @ 3pm, , current time 12pm, "event in 3 hours". , if check again @ 2pm, "event in 1 hours". sorry if seems noob question, quite stupid person when comes maths , stuff. in advance input, appreciate it!

presuming store time of article timestamp, , retrieve value in variable $articletime:

$hoursleft = floor(($articletime - time()) / 3600);

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