php - Calculate difference between time in DB and Current Time -


first off - using mysqli procedural method of using mysql via php

i trying create way click button set "timer". understand, best way (on dynamic timer - ie: 5 minutes click) calculate time() 5 minutes "now".

i want save db in case user disconnects page , reconnects (username/password login). way, when log in, keep remaining time.

now code:

i using pull dt variable sql (yyyy-mm-dd hh-mm-ss):

$expirationtime = new datetime();  if ($result->num_rows > 0) {     while($row = $result->fetch_assoc()) {         $expirationtime = $row['worktimer'];     } }  $time = strtotime($expirationtime); $expirationtime = date("y-m-d h:i:s", $time);

then pull current time:

$currenttime = date('y-m-d h:i:s');

i have done echos on both of these , displaying correctly. want figure out difference. have tried multiple ways of doing this, nothing seems work. did:

$countdown = $currenttime->diff($expirationtime); $countdown = $countdown->format("y-m-d h:i:s", $countdown);

with error of fatal error: call member function diff() on non-object in...

what might problem?

thanks!

i have updated of codes per comment's suggestions to:

$currenttimet = date('y-m-d h:i:s'); $currenttime = strtotime($currenttimet);  $time = date("y-m-d h:i:s", $expirationtime); $expirationtime = strtotime($expirationtime);  $countdown = $currenttime->diff($expirationtime); $countdown = $countdown->format("y-m-d h:i:s", $countdown); echo "c ".$currenttime."<br/> e ".$expirationtime."<br/>d ".$countdown;

same error.

it least elegant solution cut timestrings both "d,m,y,h,i,s"-substrings , feed them http://php.net/manual/de/function.mktime.php. calc difference of timestamps.


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