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exif_read_data

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

exif_read_dataLit les en-têtes EXIF dans les images

Description

exif_read_data(
    resource|string $file,
    ?string $required_sections = null,
    bool $as_arrays = false,
    bool $read_thumbnail = false
): array|false

exif_read_data() lit les en-têtes EXIF des images. Avec cette fonction, vous pouvez lire les données méta générées par les appareils photos numériques.

Les en-têtes EXIF tendent à être présents dans les images JPEG/TIFF générées par les appareils photos numériques, mais malheureusement, chaque appareil photo numérique a une idée différente de la façon dont leurs images doivent être marquées, donc, vous ne pouvez pas toujours compter sur un en-tête EXIF spécifique, bien que présent.

Les paramètres Height et Width sont calculés de la même façon que pour la fonction getimagesize(), donc leurs valeurs ne feront parties d'aucun en-tête retourné. De même, l'index html est la représentation textuelle de la hauteur/largeur utilisée dans une balise image HTML classique.

Lorsqu'un en-tête EXIF contient une note de Copyright, cet en-tête peut alors contenir lui-même deux valeurs. Comme cette solution est incohérente avec les standards EXIF 2.10, la section COMPUTED retournera les deux en-têtes, Copyright.Photographer et Copyright.Editor, tandis que les sections IFD0 contiennent le tableau d'octets avec des caractères NULL pour séparer les deux entrées ; ou bien, juste la première entrée si le type de données était erroné (comportement par défaut de EXIF). La section COMPUTED va aussi contenir une entrée Copyright, qui sera soit la chaîne originale de copyright, soit une liste de valeurs séparées par des virgules de photos et de copyright de l'auteur.

La balise UserComment présente le même problème que la balise Copyright. Elle peut stocker deux valeurs : en premier, le jeu de caractères utilisé, puis la valeur elle-même. Si c'est le cas, la section IFD contiendra uniquement le jeu de caractères, ou bien un tableau d'octets. La section COMPUTED va stocker les deux entrées UserCommentEncoding et UserComment. L'index UserComment est disponible dans les deux cas, et il est préférable de l'utiliser, plutôt que la valeur de la section IFD0.

exif_read_data() valide les données des balises EXIF en accord avec la spécification EXIF (» http://exif.org/Exif2-2.PDF, page 20).

Liste de paramètres

file

L'emplacement du fichier image. Il peut s'agir soit d'un chemin d'accès au fichier (les wrappers de flux sont également pris en charge comme d'habitude), soit d'un flux resource.

required_sections

Liste de valeur séparées par des virgules des sections qui devront être présentées dans le tableau de résultat. Si aucune des sections demandées n'est trouvée, la valeur retournée est false.

FILE FileName (nom du ficher), FileSize (taille du fichier), FileDateTime (date de modification du fichier), SectionsFound (sections trouvées)
COMPUTED Attribut Html, largeur, hauteur, couleur ou noir et blanc et plus si disponible. La largeur et la hauteur sont calculées de la même façon que la fonction getimagesize(), donc, leurs valeurs ne devraient jamais différer. De même, l'index html est la représentation textuelle de la hauteur/largeur utilisée dans une balise image HTML classique.
ANY_TAG Toutes les informations concernant cette balise, comme IFD0, EXIF, ...
IFD0 Toutes les balises IFD0. Dans les images normales, ils contiennent les dimensions de l'image, etc.
THUMBNAIL Un fichier qui contient une miniature, s'il y a un second IFD. Toutes les informations mises en balises à propos de cette miniature seront stockées dans cette section.
COMMENT En-tête de commentaire des images JPEG.
EXIF La section EXIF est une sous section de la section IFD0. Elle contient des informations plus détaillées sur les images. La plupart de ces index sont reliés aux appareils numériques.

as_arrays

Spécifie si chaque section doit devenir un tableau ou non. Les required_sections COMPUTED, THUMBNAIL et COMMENT seront toujours transformées en tableau, car elle contiennent des noms qui risquent d'être en conflit.

read_thumbnail

Lorsque défini à true, la miniature elle-même est lue. Sinon, seules les données contenues dans le taf seront lues.

Valeurs de retour

Retourne un tableau associatif où les index sont les noms des en-têtes et les valeurs sont les valeurs associées à ces en-têtes. Si aucune donnée ne peut être retournée, exif_read_data() retournera false.

Erreurs / Exceptions

Des erreurs de niveau E_WARNING et/ou E_NOTICE peuvent être levé pour des tags non supportés ou autres conditions d'erreur potentielle, mais la fonction tente quand même de lire toutes les informations compréhensibles.

Historique

Version Description
8.0.0 required_sections est désormais nullable.
7.2.0 Le paramètre file prend désormais en charge les fichier locaux ou les ressources de flux.
7.2.0 La prise en charge des formats EXIF suivants a été ajoutée :
  • Samsung
  • DJI
  • Panasonic
  • Sony
  • Pentax
  • Minolta
  • Sigma/Foveon
  • AGFA
  • Kyocera
  • Ricoh
  • Epson

Exemples

Exemple #1 Exemple avec exif_read_data()

<?php
echo "test1.jpg:<br />\n";
$exif = exif_read_data('tests/test1.jpg', 'IFD0');
echo
$exif===false ? "Aucun en-tête de donnés n'a été trouvé.<br />\n" : "L'image contient des en-têtes<br />\n";

$exif = exif_read_data('tests/test2.jpg', 0, true);
echo
"test2.jpg:<br />\n";
foreach (
$exif as $key => $section) {
foreach (
$section as $name => $val) {
echo
"$key.$name: $val<br />\n";
}
}
?>

Le premier appel échoue car l'image n'a pas d'en-tête d'information.

Résultat de l'exemple ci-dessus est similaire à :

test1.jpg:
Aucun en-tête de donnés n'a été trouvé.
test2.jpg:
FILE.FileName: test2.jpg
FILE.FileDateTime: 1017666176
FILE.FileSize: 1240
FILE.FileType: 2
FILE.SectionsFound: ANY_TAG, IFD0, THUMBNAIL, COMMENT
COMPUTED.html: width="1" height="1"
COMPUTED.Height: 1
COMPUTED.Width: 1
COMPUTED.IsColor: 1
COMPUTED.ByteOrderMotorola: 1
COMPUTED.UserComment: Exif test image.
COMPUTED.UserCommentEncoding: ASCII
COMPUTED.Copyright: Photo (c) M.Boerger, Edited by M.Boerger.
COMPUTED.Copyright.Photographer: Photo (c) M.Boerger
COMPUTED.Copyright.Editor: Edited by M.Boerger.
IFD0.Copyright: Photo (c) M.Boerger
IFD0.UserComment: ASCII
THUMBNAIL.JPEGInterchangeFormat: 134
THUMBNAIL.JPEGInterchangeFormatLength: 523
COMMENT.0: Comment #1.
COMMENT.1: Comment #2.
COMMENT.2: Comment #3end
THUMBNAIL.JPEGInterchangeFormat: 134
THUMBNAIL.Thumbnail.Height: 1
THUMBNAIL.Thumbnail.Height: 1

Exemple #2 exif_read_data() avec les flux disponible depuis PHP 7.2.0

<?php
// Ouvrir le fichier, cela devrait être en mode binaire
$fp = fopen('/path/to/image.jpg', 'rb');

if (!
$fp) {
echo
'Error: Unable to open image for reading';
exit;
}

// Essayez de lire les en-têtes EXIF
$headers = exif_read_data($fp);

if (!
$headers) {
echo
'Error: Unable to read exif headers';
exit;
}

// Afficher les entêtes 'COMPUTED'
echo 'EXIF Headers:' . PHP_EOL;

foreach (
$headers['COMPUTED'] as $header => $value) {
printf(' %s => %s%s', $header, $value, PHP_EOL);
}
?>

Résultat de l'exemple ci-dessus est similaire à :

EXIF Headers:
 Height => 576
 Width => 1024
 IsColor => 1
 ByteOrderMotorola => 0
 ApertureFNumber => f/5.6
 UserComment =>
 UserCommentEncoding => UNDEFINED
 Copyright => Denis
 Thumbnail.FileType => 2
 Thumbnail.MimeType => image/jpeg

Notes

Note:

Si mbstring est activé, EXIF va tenter de traiter l'Unicode et de choisir un jeu de caractères comme spécifié par exif.decode_unicode_motorola et exif.decode_unicode_intel. L'extension EXIF ne tentera pas de déterminer l'encodage de lui même, et il appartient à l'utilisateur de spécifier correctement l'encodage à utiliser pour le décodage en définissant l'une des deux directives INI avant d'appeler exif_read_data().

Note:

Si le paramètre file est utilisé pour passer un flux à la fonction, alors le flux doit être repositionnable. Notez que la position du pointeur d'un fichier n'est pas modifié après le retour de cette fonction.

Voir aussi

add a note

User Contributed Notes 18 notes

up
84
chadsmith729 at gmail dot com
11 years ago
When the new update came out from Apple for iOS6 it provided the ability for iPad, iPod, and iPhones to be able to upload files from the device through Safari. Obviously this will open up an array of implementations where at one point it was just not possible.

The issue comes when a photo is uploaded it will be dependent on the location of the "button" when the photo was taken. Imagine if you will that you have your iPhone turned with the button at the top and you take a photo. The photo when uploaded to your server might be "upside down".

The following code will ensure that all uploaded photos will be oriented correctly upon upload:
<?php
$image
= imagecreatefromstring(file_get_contents($_FILES['image_upload']['tmp_name']));
$exif = exif_read_data($_FILES['image_upload']['tmp_name']);
if(!empty(
$exif['Orientation'])) {
switch(
$exif['Orientation']) {
case
8:
$image = imagerotate($image,90,0);
break;
case
3:
$image = imagerotate($image,180,0);
break;
case
6:
$image = imagerotate($image,-90,0);
break;
}
}
// $image now contains a resource with the image oriented correctly
?>

What you do with the image resource from there is entirely up to you.

I hope that this helps you identify and orient any image that's uploaded from an iPad, iPhone, or iPod. Orientation for the photo is the key to knowing how to rotate it correctly.
up
4
Tim
4 years ago
The following code:
<?php
$data
= exif_read_data('foo.jpg');
var_dump($data['Keywords']);
?>
produces string(15) "???????????????"

Adding
<?php
ini_set
('exif.decode_unicode_motorola', 'UCS-2LE');
?>
before the call to exif_red_data produces
string(15) "landscape;;field"
up
7
darkain at darkain dot com
15 years ago
I wanted some quick and easy functions for computing the shutter speed and f-stop. I couldn't find any anywhere, so I made some. It took some research :

<?php
function exif_get_float($value) {
$pos = strpos($value, '/');
if (
$pos === false) return (float) $value;
$a = (float) substr($value, 0, $pos);
$b = (float) substr($value, $pos+1);
return (
$b == 0) ? ($a) : ($a / $b);
}

function
exif_get_shutter(&$exif) {
if (!isset(
$exif['ShutterSpeedValue'])) return false;
$apex = exif_get_float($exif['ShutterSpeedValue']);
$shutter = pow(2, -$apex);
if (
$shutter == 0) return false;
if (
$shutter >= 1) return round($shutter) . 's';
return
'1/' . round(1 / $shutter) . 's';
}

function
exif_get_fstop(&$exif) {
if (!isset(
$exif['ApertureValue'])) return false;
$apex = exif_get_float($exif['ApertureValue']);
$fstop = pow(2, $apex/2);
if (
$fstop == 0) return false;
return
'f/' . round($fstop,1);
}
?>
up
2
omerg at lucidcode dot com dot tr
5 years ago
The example provided for displaying exif array content is not working in recent version because not all entry values are of array type.

This is an alternative echo loop:

<?php
echo "test1.jpg:<br />\n";
$exif = exif_read_data('tests/test1.jpg', 'IFD0');
echo
$exif===false ? "No header data found.<br />\n" : "Image contains headers<br />\n";

$exif = exif_read_data('tests/test2.jpg', 0, true);
echo
"test2.jpg:<br />\n";
foreach (
$exif as $key => $section) {

if (!
is_array ($section)) {
echo
"$key: $section<br />\n";
} else {
foreach (
$section as $name => $val) {
echo
"$key.$name: $val<br />\n";
}
}

}
?>
up
8
drpain at webster dot org dot za
12 years ago
Please note that when resizing images with GD and most image processing scripts or applications you will loose the EXIF information. What I did as a workaround is book this information into MySQL before I re-size images.

<?php

// This function is used to determine the camera details for a specific image. It returns an array with the parameters.
function cameraUsed($imagePath) {

// Check if the variable is set and if the file itself exists before continuing
if ((isset($imagePath)) and (file_exists($imagePath))) {

// There are 2 arrays which contains the information we are after, so it's easier to state them both
$exif_ifd0 = read_exif_data($imagePath ,'IFD0' ,0);
$exif_exif = read_exif_data($imagePath ,'EXIF' ,0);

//error control
$notFound = "Unavailable";

// Make
if (@array_key_exists('Make', $exif_ifd0)) {
$camMake = $exif_ifd0['Make'];
} else {
$camMake = $notFound; }

// Model
if (@array_key_exists('Model', $exif_ifd0)) {
$camModel = $exif_ifd0['Model'];
} else {
$camModel = $notFound; }

// Exposure
if (@array_key_exists('ExposureTime', $exif_ifd0)) {
$camExposure = $exif_ifd0['ExposureTime'];
} else {
$camExposure = $notFound; }

// Aperture
if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED'])) {
$camAperture = $exif_ifd0['COMPUTED']['ApertureFNumber'];
} else {
$camAperture = $notFound; }

// Date
if (@array_key_exists('DateTime', $exif_ifd0)) {
$camDate = $exif_ifd0['DateTime'];
} else {
$camDate = $notFound; }

// ISO
if (@array_key_exists('ISOSpeedRatings',$exif_exif)) {
$camIso = $exif_exif['ISOSpeedRatings'];
} else {
$camIso = $notFound; }

$return = array();
$return['make'] = $camMake;
$return['model'] = $camModel;
$return['exposure'] = $camExposure;
$return['aperture'] = $camAperture;
$return['date'] = $camDate;
$return['iso'] = $camIso;
return
$return;

} else {
return
false;
}
}

?>

An example of it's use follows:

<?php

$camera
= cameraUsed("/img/myphoto.jpg");
echo
"Camera Used: " . $camera['make'] . " " . $camera['model'] . "<br />";
echo
"Exposure Time: " . $camera['exposure'] . "<br />";
echo
"Aperture: " . $camera['aperture'] . "<br />";
echo
"ISO: " . $camera['iso'] . "<br />";
echo
"Date Taken: " . $camera['date'] . "<br />";

?>

Will display the following, depending on the data:

Camera Used: SONY DSC-S930
Exposure Time: 1/400
Aperture: f/4.3
ISO: 100
Date Taken: 2010:12:10 18:18:45

If the image has been re-sized and the information is no longer available then you should receive the following when echoing the same:

Camera Used: Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: Unavailable

Some cameras do not capture all the information, for instance Blackberry phones do not record an aperture, or iso and you will get Unavailable for those fields.

I hope you find this helpful.
up
2
mafo at mafo removethis dot sk
16 years ago
some cameras (most higher models) have position senzor (gyroskope?) and taking-position is wrote in EXIF, here is simple script for automatic rotating images

<?php
$exif
= exif_read_data($filename);
$ort = $exif['IFD0']['Orientation'];
switch(
$ort)
{
case
1: // nothing
break;

case
2: // horizontal flip
$image->flipImage($public,1);
break;

case
3: // 180 rotate left
$image->rotateImage($public,180);
break;

case
4: // vertical flip
$image->flipImage($public,2);
break;

case
5: // vertical flip + 90 rotate right
$image->flipImage($public, 2);
$image->rotateImage($public, -90);
break;

case
6: // 90 rotate right
$image->rotateImage($public, -90);
break;

case
7: // horizontal flip + 90 rotate right
$image->flipImage($public,1);
$image->rotateImage($public, -90);
break;

case
8: // 90 rotate left
$image->rotateImage($public, 90);
break;
}

?>

$image->rotateImage() is inspired by example of http://php.net/manual/en/function.imagerotate.php
$image->flipImage() is inspired by http://php.net/manual/en/function.imagecopy.php#42803 (thank you)
up
0
service at tianex dot com
3 months ago
this error happens when get jpeg file exif information

exif_read_data(): Error reading from file: got=x3FFA(=16378) != itemlen-2=x4325(=17189)
up
0
TNTcode
6 years ago
<?php

// auto rotates an image file based on exif data from camera
// if destination file is specified then it saves file there, otherwise it will display it to user
// note that images already at normal orientation are skipped (when exif data Orientation = 1)

if(!function_exists("gd_auto_rotate")){
function
gd_auto_rotate($original_file, $destination_file=NULL){

$original_extension = strtolower(pathinfo($original_file, PATHINFO_EXTENSION));
if(isset(
$destination_file) and $destination_file!=''){
$destination_extension = strtolower(pathinfo($destination_file, PATHINFO_EXTENSION));
}

// try to auto-rotate image by gd if needed (before editing it)
// by imagemagik it has an easy option
if(function_exists("exif_read_data")){

$exif_data = exif_read_data($original_file);
$exif_orientation = $exif_data['Orientation'];

// value 1 = normal ?! skip it ?!

if($exif_orientation=='3' or $exif_orientation=='6' or $exif_orientation=='8'){

$new_angle[3] = 180;
$new_angle[6] = -90;
$new_angle[8] = 90;

// load the image
if($original_extension == "jpg" or $original_extension == "jpeg"){
$original_image = imagecreatefromjpeg($original_file);
}
if(
$original_extension == "gif"){
$original_image = imagecreatefromgif($original_file);
}
if(
$original_extension == "png"){
$original_image = imagecreatefrompng($original_file);
}

$rotated_image = imagerotate($original_image, $new_angle[$exif_orientation], 0);

// if no destination file is set, then show the image
if(!$destination_file){
header('Content-type: image/jpeg');
imagejpeg($rotated_image, NULL, 100);
}

// save the smaller image FILE if destination file given
if($destination_extension == "jpg" or $destination_extension=="jpeg"){
imagejpeg($rotated_image, $destination_file,100);
}
if(
$destination_extension == "gif"){
imagegif($rotated_image, $destination_file);
}
if(
$destination_extension == "png"){
imagepng($rotated_image, $destination_file,9);
}

imagedestroy($original_image);
imagedestroy($rotated_image);

}
}
}
}

?>
up
0
b at asdflolinternet dot de
8 years ago
Problem with "S�o�m�e� �T�e�x�t��" on value(s), exif[IFD0][Title] for example, when they were edited trough windows right click properties and then got read with the read_exif_data() function.
try:

$exif_['IFD0']['Title']=mb_convert_encoding($exif_['IFD0']['Title'],"auto","byte2le");

works on UTF-8 and so.

//
// outputs all available character encodings and prints on screen
// foreach(mb_list_encodings() as $chr)
// {$test[$chr]=mb_convert_encoding($image[IFD0][Title],'auto',$chr);}
// exit(print_r($test));
//
up
0
Eion Robb
8 years ago
I was needing to use exif_read_data() to read out the orientation flag, only to find that the webhost didn't have the exif extension available for use. Instead, I hacked up a regex that worked fairly well as a replacement

<?php
$orientation
= 1;
if (
function_exists('exif_read_data')) {
$exif = exif_read_data($filename);
if (isset(
$exif['Orientation']))
$orientation = $exif['Orientation'];
} else if (
preg_match('@\x12\x01\x03\x00\x01\x00\x00\x00(.)\x00\x00\x00@', file_get_contents($filename), $matches)) {
$orientation = ord($matches[1]);
}
?>
up
0
Clive dot Moore at ma-design dot com
10 years ago
Following up on darkain at darkain dot com script for grabbing the ShutterSpeedValue from exif data...
@http://php.net/manual/en/function.exif-read-data.php

I have found that the option shown for ShutterSppedValue, can also be ExposureTime in the exif data.

Also the code as written provides a WRONG return, as the return is always 1 so you get 1/1sec.

Here is corrected code, or a version that corrects what is obviously not working after 5 years since it was originally developed::

Here is the updated version for:: $exif[ExposureTime]

function exif_get_float($value) {
$pos = strpos($value, '/');
if ($pos === false) return (float) $value;
$a = (float) substr($value, 0, $pos);
$b = (float) substr($value, $pos+1);
return ($b == 0) ? ($a) : ($a / $b);
};

function exif_get_exposureTime(&$exif) {
if (!isset($exif['ExposureTime'])) return false;
$apex = exif_get_float($exif['ExposureTime']);
$shutter = 1/$apex;
// above 1 sec exposure time::
if ($shutter <= 1) return round($apex) . ' seconds';

return '1/' . round(1 / $apex) . 'sec';
};
up
0
hoangvu4000 at gmail dot com
10 years ago
This is function, resize image and don't rotates images have exif info

PHP must be enabled:
extension=php_mbstring.dll
extension=php_exif.dll

<?php
function CreateThumbnail($pic,$thumb,$thumbwidth, $quality = 100)
{

$im1=ImageCreateFromJPEG($pic);

//if(function_exists("exif_read_data")){
$exif = exif_read_data($pic);
if(!empty(
$exif['Orientation'])) {
switch(
$exif['Orientation']) {
case
8:
$im1 = imagerotate($im1,90,0);
break;
case
3:
$im1 = imagerotate($im1,180,0);
break;
case
6:
$im1 = imagerotate($im1,-90,0);
break;
}
}
//}
$info = @getimagesize($pic);

$width = $info[0];

$w2=ImageSx($im1);
$h2=ImageSy($im1);
$w1 = ($thumbwidth <= $info[0]) ? $thumbwidth : $info[0] ;

$h1=floor($h2*($w1/$w2));
$im2=imagecreatetruecolor($w1,$h1);

imagecopyresampled ($im2,$im1,0,0,0,0,$w1,$h1,$w2,$h2);
$path=addslashes($thumb);
ImageJPEG($im2,$path,$quality);
ImageDestroy($im1);
ImageDestroy($im2);
}
?>
up
0
michael [at[ thisiswilson [dot[ com
15 years ago
From - darkain at darkain dot com 's example.

If all the data is from the same image - simply

<?php
$exif_data
= exif_read_data ( $_FILES['photo']

$emake =$exif_data['Make'];
$emodel = $exif_data['Model'];
$eexposuretime = $exif_data['ExposureTime'];
$efnumber = $exif_data['FNumber'];
$eiso = $exif_data['ISOSpeedRatings'];
$edate = $exif_data['DateTime'];
?>

will work, I tried using the PEL library, and while pretty cool, I can't for the life understand how to call some things, this is simpler if your system is pretty basic or if you're in a rush. If you have time, try playing with PEL. It's not maintained at the moment though..

http://pel.sourceforge.net/
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0
Anonymous
17 years ago
When reading EXIF information from the 'WINXP' group, you may need to change used encoding from the default "ISO-8859-15" to "UTF-8". This can be done in php.ini or in your code:

<?php
ini_set
('exif.encode_unicode', 'UTF-8');

$exif = exif_read_data('TEST.JPG', 0, true);
echo
$exif['WINXP']['Title'];
?>

Useful documentation about EXIF:
http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html
See also comments next to XPTitle and XPAuthor.
up
-1
iam at thatguy dot co dot za
10 years ago
I posted the original version of the function, but after using it for a while I discovered I didn't do enough error checking.

I have re-factored it somewhat, and it now returns an empty array should it not be able to read the image's exif. If it is able to, it will return the details it was able to retrieve. And this should be without error.

I am suppressing errors, because if you pass it images which cannot parse, you will get a warning.

<?php

# Modified Version of cameraUsed, no longer returns date.
public function cameraUsed($imagePath)
{
# The default empty return
$return = array(
'make' => "",
'model' => "",
'exposure' => "",
'aperture' => "",
'iso' => ""
);

// Check if the variable is set and if the file itself exists before continuing
if ((isset($imagePath)) AND (file_exists($imagePath)))
{
// There are 2 arrays which contains the information we are after, so it's easier to state them both
$exif_ifd0 = @read_exif_data($imagePath ,'IFD0' ,0);
$exif_exif = @read_exif_data($imagePath ,'EXIF' ,0);

# Ensure that we actually got some information
if (($exif_ifd0 !== false) AND ($exif_exif !== false))
{
// Make
if (@array_key_exists('Make', $exif_ifd0))
{
$return['make'] = $exif_ifd0['Make'];
}

// Model
if (@array_key_exists('Model', $exif_ifd0))
{
$return['model'] = $exif_ifd0['Model'];
}

// Exposure
if (@array_key_exists('ExposureTime', $exif_ifd0))
{
$return['exposure'] = $exif_ifd0['ExposureTime'];
}

// Aperture
if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED']))
{
$return['aperture'] = $exif_ifd0['COMPUTED']['ApertureFNumber'];
}

// ISO
if (@array_key_exists('ISOSpeedRatings',$exif_exif))
{
$return['iso'] = $exif_exif['ISOSpeedRatings'];
}
}
}

# Return either an empty array, or the details which we were able to extrapolate.
return $return;
}

?>
up
-2
lincolnzsilva at gmail dot com
15 years ago
Get some EXIFs fields (easy way):

<?php
$exif_make
= exif_read_data ( $_FILES['photo']['tmp_name'] ,'IFD0' ,0 );
$emake = $exif_make['Make'];

$exif_model = exif_read_data ( $_FILES['photo']['tmp_name'] ,'IFD0' ,0 );
$emodel = $exif_model['Model'];

$exif_exposuretime = exif_read_data ( $_FILES['photo']['tmp_name'] ,'EXIF' ,0 );
$eexposuretime = $exif_exposuretime['ExposureTime'];

$exif_fnumber = exif_read_data ( $_FILES['photo']['tmp_name'] ,'EXIF' ,0 );
$efnumber = $exif_fnumber['FNumber'];

$exif_iso = exif_read_data ( $_FILES['photo']['tmp_name'] ,'EXIF' ,0 );
$eiso = $exif_iso['ISOSpeedRatings'];

$exif_date = exif_read_data ( $_FILES['photo']['tmp_name'] ,'IFD0' ,0 );
$edate = $exif_date['DateTime'];
?>
up
-2
wdierkes at 5dollarwhitebox dot org
16 years ago
Using the exif methods to read WINXP data returns unexpected results unless both exif and mbstring are compiled statically. Please reference the following bug reports:

Bug #31980
Bug #23105


Specifically, the last comment on #23105:

"[8 Apr 2003 4:26pm UTC] edink@php.net

This cannot be fixed due to the fact that mbstring has been removed from PHP core (it has been 'unbundled') and the rest of core files and other extensions cannot use mbstring functionality when it is compiled as a shared library (dll).
"

If exif is compiled statically (--enable-exif) and mbstring compiled as a DSO module (--enable-mbstring=shared) then exif_read_data may only return a single character rather than the entire string.

Compiling both exif and mbstring statically (--enable-exif --enable-mbstring) resolves the issue.
up
-5
kurt at mandella dot biz
10 years ago
Photos processed in Picasa often contain garbage data in the "MAKERNOTE" section and under EXIF.MakerNote, (UTF8) like:

[MakerNote] => r0~Þæ"î2OÔy  e §…b! ) ) EI "ÐÓ
#s &0{ 'Û (å -Ð`ÿÿ@ÿÿÿìE è€Ýÿÿ  ÿÿÿÿÿÿx "ú»Dóÿ H ?.}BúIMG:DIGITAL IXUS 100 IS JPEGFirmware Version 1.00s›xÇØÿÿÿ–l¥ÿÿÿ  ØÌÌxŒ ÿÿÌÌŸãÿÿÿ¼Ž(½ (½T‹U’‹d–~Ø“¥ÿÿÿ ÀÿœªãjáÀpgaXfaWb[Te«
8ú5:Áð-3åÿÿ5»ÿ ‹;ßÊ Š €à€` ¸ ddîÿîÿîÿîÿîÿîÿ
ÿÿŠ1—ÏàôÉæ׬gªiï

This can't be written to Blob in MySql. The following code removes the garbage tags.

$exif = exif_read_data($process_photo, 0, 'EXIF');

if($exif['IFD0']['Software'] == "Picasa"){

foreach ($exif as $key => $section){

if($key != "MAKERNOTE"){
foreach ($section as $name => $val){
if($name != 'MakerNote'){
$exifA[$key][$name] = $val;
}
}
$exifB[$key] = $exifA[$key];
}
}
$serialized_exif = serialize ($exifB);
}else{
$serialized_exif = serialize ($exif);
}
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