specific exif retrieval question

mfaulkner

Just a quick question,

I'm trying to retrieve certain data from 'example.jpg'. I've figured out how to display all the data, with the use of ANY_TAG:

print_r(exif_read_data('example.jpg', ANY_TAG));

How would I retrieve, for example;

EXIF.ExifImageWidth: 3072
EXIF.ExifImageLength: 2304

Thanks,

Mark

bradgrafelman

If you look at the manual entry (or just the print_r() output) for [man]exif_read_data[/man], you'll see that it returns an associative array. So, all you have to do is store the output of the function into a variable and then use that variable as an associative array.
Are you aware that "ExifImageWidth"/"Length" doesn't necessarily tell you the width/height of the image file itself, but instead of the original image file?

mfaulkner

Thanks for your reply, I've checked php.net manual and this is how far I've got. Its displaying a whole load of data on screen.

$array_exif = array(exif_read_data('example.jpg', ANY_TAG, 1, false));

print_r($array_exif);

I think the problem I'm having is I'm not too sure how to grab a value from, as you point out, an associative array.

For example just echo-ing:
[DateTimeOriginal] => 2007:02:10 10:19:16

bradgrafelman

Well, for one, this function returns an array, so there's no need to use [man]array/man to encase the returned value inside an array.

As for using an associative array, it's really simple:

echo $array['key_here'];

echo's the value for the index (or key) "key_here" from the array $array. So, for your $array_exif (once you remove the extra array() stuff), you'd echo whichever keys you want... DateTimeOriginal for example.

For more information on arrays, see this man page: [man]language.types.array[/man].