Re: [PHP] difference between two times? Date_diff and DateTime::diff

Hi Tom,

Thanks for the reply,  I believe I have a fair understanding of  
functions, and I have followed the example on the PHP manual page ( http://uk3.php.net/manual/en/function.date-diff.php 
  ), ideally I want to know how to use the class DateTime::diff, how  
can I use the DateTime::diff to get the difference between two times/ 
dates ? I suppose then I'm after the syntax

would it be like this for example:
$DIfferenceInTime  = DateTime::diff(10:00,12:32);

Thanks again for helping me out.



On 16 Jun 2009, at 12:33, Tom Chubb wrote:

> Matt,
> Do you understand how to use functions?
> A function is defined like this:
>
> function () {
> //code goes here
> }
>
> You can pass arguments to be used in a function like this:
>
> function($arg1, $arg2) {
> //code goes here
> }
>
> In the first example on the following page: http://uk3.php.net/manual/en/function.date-diff.php
> To call the function you need to provide two arguments: $dtTime1 &   
> $dtTime2
>
> To use in a script, you need to first define the function, as per  
> the example:
>
> <?php
>
> function GetDeltaTime($dtTime1, $dtTime2)
> {
>   $nUXDate1 = strtotime($dtTime1->format("Y-m-d H:i:s"));
>   $nUXDate2 = strtotime($dtTime2->format("Y-m-d H:i:s"));
>
>   $nUXDelta = $nUXDate1 - $nUXDate2;
>   $strDeltaTime = "" . $nUXDelta/60/60; // sec -> hour
>
>   $nPos = strpos($strDeltaTime, ".");
>   if (nPos !== false)
>     $strDeltaTime = substr($strDeltaTime, 0, $nPos + 3);
>
>   return $strDeltaTime;
> }
>
> ?>
>
> Then you need to call the function like this:
>
> <?php
> GetDeltaTime("time1-goes-here", "time2-goes-here")
> ?>
>
> And it should spit out the difference.
>
> Code is untested and if you didn't follow that I suggest you read up  
> on functions: http://www.w3schools.com/php/php_functions.asp
>
> Hope this helps - I'm probably in a similar situation to you and  
> have been dabbling with PHP for a few years just as a hobby but  
> thought I'd try and help out.
> You'll learn a lot from reading this list as well.
>
> Cheers and good luck,
>
> Tom
>
>
> 2009/6/16 Matthew Croud <[email protected]>
>
> Hello,
>
> My journey of learning PHP is going well, so i've decided to make a  
> small program which works out the difference between two times and  
> records the data in a text file.
>
> I've searched the PHP manual for functions which can help me out,  
> and I discovered the function Date_diff ( http://uk3.php.net/manual/en/function.date-diff.php 
>  )and the class DateTime::diff ( http://uk3.php.net/manual/en/datetime.diff.php 
>  )
>
> My question is, how on earth do I use these functions ? I really  
> don't understand the manual documentation.
>
> I've just moved onto the subject of classes and so I'm fairly new to  
> the concept, although I am following it well.
>
> If someone could explain to me how to use ether of these ( Date_diff  
> and DateTime::diff ) I would be VERY grateful.
>
> Thank you so much!
> Matt
>
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>
>
>
>

Matthew Croud
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