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<?php
/**
* Exif Processing Library
*
* @package TidypicsExif
*/
/**
* Pull EXIF data from image file
*
* @param TidypicsImage $image
*/
function td_get_exif($image) {
// catch for those who don't have exif module loaded
if (!is_callable('exif_read_data')) {
return;
}
$mime = $image->mimetype;
if ($mime != 'image/jpeg' && $mime != 'image/pjpeg') {
return;
}
$filename = $image->getFilenameOnFilestore();
$exif = exif_read_data($filename, 'IFD0,EXIF', true);
if (is_array($exif)) {
$data = array_merge($exif['IFD0'], $exif['EXIF']);
foreach ($data as $key => $value) {
if (is_string($value)) {
// there are sometimes unicode characters that cause problems with serialize
$data[$key] = preg_replace( '/[^[:print:]]/', '', $value);
}
}
$image->tp_exif = serialize($data);
}
}
/**
* Grab array of EXIF data for display
*
* @param TidypicsImage $image
* @return array|false
*/
function tp_exif_formatted($image) {
$exif = $image->tp_exif;
if (!$exif) {
return false;
}
$exif = unserialize($exif);
$model = $exif['Model'];
if (!$model) {
$model = "N/A";
}
$exif_data['Model'] = $model;
$exposure = $exif['ExposureTime'];
if (!$exposure) {
$exposure = "N/A";
}
$exif_data['Shutter'] = $exposure;
//got the code snippet below from http://www.zenphoto.org/support/topic.php?id=17
//convert the raw values to understandible values
$Fnumber = explode("/", $exif['FNumber']);
if ($Fnumber[1] != 0) {
$Fnumber = $Fnumber[0] / $Fnumber[1];
} else {
$Fnumber = 0;
}
if (!$Fnumber) {
$Fnumber = "N/A";
} else {
$Fnumber = "f/$Fnumber";
}
$exif_data['Aperture'] = $Fnumber;
$iso = $exif['ISOSpeedRatings'];
if (!$iso) {
$iso = "N/A";
}
$exif_data['ISO Speed'] = $iso;
$Focal = explode("/", $exif['FocalLength']);
if ($Focal[1] != 0) {
$Focal = $Focal[0] / $Focal[1];
} else {
$Focal = 0;
}
if (!$Focal || round($Focal) == "0") {
$Focal = 0;
}
if (round($Focal) == 0) {
$Focal = "N/A";
} else {
$Focal = round($Focal) . "mm";
}
$exif_data['Focal Length'] = $Focal;
$captured = $exif['DateTime'];
if (!$captured) {
$captured = "N/A";
}
$exif_data['Captured'] = $captured;
return $exif_data;
}
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