If you would like to get the amount of hours between 10:00 and 12:00 then use this!
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function timeDiff($firstTime,$lastTime) {
$firstTime=strtotime($firstTime);
$lastTime=strtotime($lastTime);
$timeDiff=$lastTime-$firstTime;
return $timeDiff;
}
echo (timeDiff("10:00","12:00")/60)/60;
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