[RESOLVED] Problem with 'printing' values..

pewe

First of all please forgive my level of knowledge (or lack of it) at this stage.
I recently retired and as a 'hobby' took up photography and am now trying to build a web site to share the results with family and friends.

To do this will take me a while as I need to study various aspects of web creation, one of which is PHP.

My initial problem is that I have a script which displays photographs and also the detail (EXIF) contained in the photograph, but a part of the data is not held in the way I need to display and then at a later store it to a database.

So I found a separate script which converts the data to the form I need it. I understand the concept of the second script (I think) but cannot figure out how to include it in the original script to display the information.

The 'combined' script is attached. I have attached it so I can refer to it by line number (and the 'php' wrapping does not show line numbers).

The first thing the script does is loads an image file - line 7
The next is to extract the EXIF data - line 11 - which is read to an 'array' I believe.
The original script to display the exif data used to start at line 64 where it loaded the data in $ReadEXIFData, so I commented that out and called the data back in from the already loaded $exif - that way I had to make no changes to the script that followed.
between lines 72 and 173 the data is extracted directly as is from the EXIF, and lines 178 to the end display the data using html.
I changed this html to include the headings 'Decimal Longitude' and ' Decimal Latitude' which is where I want to display the calculated values.

As the GPS Latitude and Longitude are held as an array of Degrees/Minutes/Seconds in the EXIF, I added lines 13 to 57 of the script, copying them over from the conversion script, and this extracts the GPS arrays and convert them to Decimal, the results being placed in an array (line 4).
To test it, it is printed in lines 50 to 55, the results appearing in the top left of the web page.

What I am having trouble with is displaying this information in the correct place in the box where it says NEED CODE (ie including them in the html)

If anyone has the time and inclination to offer any guidance on how to do this would be appreciated - bearing in mind I have to ament this script later to store all the data in a sql database.

TIA

pewe

Sorry, I don't seem to have the ability to edit posts, and forgot to put the web page link in the post, so here it is.

bpat1434

So you want to take the degrees, minutes and seconds notation of a GPS location and get the decimal notation of it correct? So you take something like 15° 15' 30" then you'd have 15 + (15 / 60) + (30 / 3600).

This is a pretty-good read on how to convert DMS to decimal: GPS Latitude and Longitude Converter - CSG Network

So in your code you could do something like:

<?php // Ignore these two lines, used only for syntax highlighting
?>
			<td width="40&#37;" valign="top">
			<p>Degrees</p>
			<p><? echo $GPSDegreesLat; ?></p>
			<br />
			<p>Minutes</p>
			<p><? echo $GPSMinutesLat; ?></p>
			<br />
			<p>Seconds</p>
			<p><? echo $GPSSecondsLat; ?></p>
			<br />
			<p>Decimal Latitude</p>
			<p>
				<?php
					echo $GPSDegreesLat + ($GPSMinutesLat / 60) + ($GPSSecondsLat / 3600);
				?>
			</p>
			</td>

pewe

Thanks for your input bpat,
However it is unfortunately not a simple as a mathematical formula.
The EXIF hols the Degrees as n1/n2, the minutes as n1/n2 and the seconds as n1/n2, so the content has to be split into two values, one divided into the other to then return one decimal value, then the last two of these have to be converted (ie div 60 or 3600) and all 3 added together.
THEN, the returned values have to be treated as positive or negative DEPENDING on a fouth value and whether the content is N or S, or E or W.

Anyway, the first part of the script (lines 13 to 57) does the correct calculation and displays it in the top right of the web page.

What I have a problem with is understanding how to display it where I have allocated space in the box below the image.

bpat1434

Well there is this code on lines 50 - 55:

$gps = getGPS();
     $str .= "DecimalLatitude: " . $gps[0] . "<br>\n";
     $str .= "DecimalLongitude: " . $gps[1] . "<br>\n";
     $str .= "\n  </div></td>\n";
     $str .= " </tr>\n";
     echo $str;

That's giving you the output in the top left of the page. If you wanted you could edit the $gps array so that there is a key "latitude" which has the value $gps[0] and a key "longitude" which has the value $gps[1]. Then down in your table display you could just use:

echo $gps["latitude"];

and longitude to display the correct data.

I checked the script and the variable $gps is only used to store that decimal data. So it's safe to use it later in the script to display the values.

pewe

I resolved my problem, stupidly I had missed a couple of ':' when I tried to call cack the array :o

pewe

Sorry bpat, we cross posted with the last 2 answers.

Thanks again for your input - now the next bit, putting all the results in a database.

PS - I'll have to look in the forum info in more detail, but do you know why can't I edit my posts ?

Derokorian

pewe;11005254 wrote:
PS - I'll have to look in the forum info in more detail, but do you know why can't I edit my posts ?

New members are required to be here for a certain amount of time and/or reach a certain post count before they can edit a post. Also you can only edit for certain amount of time once you gain the ability.

pewe

Thanks Derokorian

I guessed that might be the case, but couldn't find a reference to the rules.

Weedpacket

pewe;11005275 wrote:
Thanks Derokorian

I guessed that might be the case, but couldn't find a reference to the rules.

There is a reference in one of the FAQs.

pewe

Thanks - missed that!