Validating Exif Data

[foucquet]

OK, so one of my cameras includes a "Copyright" field in the array returned from the exif data and one doesn't. Does anyone have any ideas how one would test for this field, and if it doesn't exist fill the relevant variable with the copyright info. I have been trying to solve this for a couple of hours now without a great deal of success, what I have is:-

$exif = exif_read_data('thistle.jpg', 'EXIF');

$name = $exif['FileName'];
$height = $exif['ExifImageWidth'];
$width = $exif['ExifImageLength'];
$copy = $exif['Copyright'];
$model = $exif['Model'];
$exposuretime = $exif['ExposureTime'];
$fnumber = $exif['COMPUTED']['ApertureFNumber'];
$iso = $exif['ISOSpeedRatings'];
$date = $exif['DateTime'];

echo "File Name: $name<br />";
echo "Comment: " . $exif['COMMENT'][0] . "<br />";
echo "Height: $height<br />";
echo "Width: $width<br />";
echo "Copyright: $copy<br />";
echo "Camera: $model<br />";
echo "Shutter Speed: $exposuretime<br />";
echo "F number: $fnumber<br />";
echo "ISO: " . $iso . "<br />";
echo "Date & Time: $date<br /><br />";

 

Whatever I try always seems to end with "Notice: Undefined index: Copyright in C:\wamp\www\php\exif-read.php on line 11" it is obviously

$copy = $exif['Copyright'];

that is causing the problem, and I can't work out just how to test for the existence of "Copyright" and head this problem off...

[foucquet]

Problem solved. I was looking for a more complex solution than it turned out to be, it was as simple as:-

if(isset($exif['Copyright'])) $copy = $exif['Copyright'];
else
    $copy = "**** ****";

[foucquet]

There is a better way of doing the above:-

 

<?php

//>>> Set up the array for the meta data.
$exifdata = array('caption', 'copy', 'camera', 'shutter', 'fNo', 'iso', 'date', 'time');

//>>> Read the EXIF data from the image.
$exif = exif_read_data('image.jpg', 'EXIF');

/*
Test for the existence of the "Copyright" key in the $exif array and update
the "copy" key of the $exifdata array accordingly.
*/

if (array_key_exists('Copyright', $exif)) {
    echo "The 'Copyright' element is in the array, and has the value " . $exif['Copyright'];
    $exifdata['copy'] = $exif['Copyright'];
}
else {
  $exifdata['copy'] = "Copyright info";
  echo "This image is the copyright of " . $exifdata['copy'] . " and may not be used without prior permission.";
}

?>