Calculating time difference between two 24H time in php -

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I am struggling to calculate time difference between two 24-hour format. The data extracted from my database is as follows: 

  $ timein = "09:00"; $ Timeout = "17:00"; $ Timediff = $ timein - $ Timeout   
 As above, how do I get  $ timediff = 8 ?   
 
 
 If you set them first in full dates:  
  $ timein = "09:00"; $ Timeout = "17:00"; $ Datein = strtotime (date ("Ymd". $ Timein); $ dateout = strtotime (date ("Ymd". $ Timeout);   
 Therefore, actually the date that you use (Today's date) can be any other date because it is about the time between all hours. Then you can create php  date  function:  
  $ hourIn = date ("G", $ datein); // = 9 $ hourOut = date ("G", $ dateout); // = 17   
 simple Mathematics followed:  
  $ diff = $ hour hour - $ hourIn; // = 8

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