-----Original Message-----
From: Matthew Croud [mailto:matt@xxxxxxxxxxxxxxxxxx]
Sent: 16 June 2009 12:42
To: Tom Chubb
Cc: PHP General list
Subject: Re: 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 <matt@xxxxxxxxxxxxxxxxxx>
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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