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exif_read_data

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

exif_read_dataLê os cabeçalhos EXIF de um arquivo de imagen

Descrição

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

A função exif_read_data() lê os cabeçalhos EXIF de um arquivo de imagem. Desta forma é possível ler metadados gerados por câmeras digitais.

Cabeçalhos EXIF tendem a estar presentes em imagens JPEG/TIFF geradas por camêras digitais, mas infelizmente, cada fabricante de camêra digital tem uma idéia diferente de como marcar as suas imagens, então não se pode confiar sempre que um cabeçalho EXIF específico estará presente.

Altura (Height) e largura (Width) sao computadas da mesma maneira que getimagesize() faz, então seus valores não devem ser parte de nenhum cabeçalho retornado. Além disso, html é uma string de texto com altura/largura a ser usado dentro de umHTML normal.

Quando um cabeçalho Exif contém uma nota de direitos autorais, esta nota pode conter dois valores. Como a solução é inconsistente com o padrão Exif 2.10 a seção COMPUTED irá retornar ambas as entradas Copyright.Photographer e Copyright.Editor enquando que as seções IFD0 contém um array de bytes com o caractere NULL que separa as duas entradas. Ou apenas a primeira entrada se o tipo de dados estiver errado (funcionamento normal do Exif). COMPUTED irá conter também a entrada Copyright que será a string original do copyright ou uma lista separada por vírgula dos direitos autorais da foto e do editor.

A marca UserComment tem o mesmo problema que a marca de Copyright. Ela pode guardar dois valores. Primeiro a codificação usada e em segundo o valor em si. Então a seção IFD contém somente a codificação ou um array de bytes. A seção COMPUTED irá guardar ambos nas entradas UserCommentEncoding e UserComment. A entrada UserComment está disponível em ambos os casos então deve ser usada em preferência ao valor da seção IFD0.

exif_read_data() também valida marcas de dados EXIF de acordo com a especificação EXIF (» http://exif.org/Exif2-2.PDF, página 20).

Parâmetros

file

A localização do arquivo de imagem. Pode ser uma caminho para o arquivo (empacotadores de fluxo são também suportados) ou um fluxo do tipo resource.

required_sections

Uma lista de seções separadas por vírgula que precisam estar presentes no arquivo para produzir o resultado do tipo array. Se nenhuma das seções informadas puder ser encontrada o valor de retorno é false.

FILE FileName, FileSize, FileDateTime, SectionsFound
COMPUTED html, Width, Height, IsColor, e mais se disponíveis. Height e Width são computadas da mesma maneira que getimagesize() faz, portanto seus valores não deve ser parte de nenhum cabeçalho retornado. Além disso, html é uma string de texto com altura/largura a ser usado dentro de um HTML normal.
ANY_TAG Qualquer informação que tenha uma marca, ex.: IFD0, EXIF, ...
IFD0 Todos os dados marcados de IFD0. Em arquivos de imagem normais, contém o tamanho da imagem e outros dados.
THUMBNAIL Um arquivo deveria ter uma miniatura se tiver um segundo IFD. Todas as informações marcadas sobre a miniatura embutida estão gravadas nesta seção.
COMMENT Cabeçalho de comentários de imagens JPEG.
EXIF A seção EXIF é uma sub-seção de IFD0. Contém informação mais detalhada sobre uma imagem. A maior parte destas entradas são relacionadas a câmeras digitais.

as_arrays

Especifica se cada seção se torna ou não um array. As seções COMPUTED, THUMBNAIL E COMMENT de required_sections sempre se toranm arrays por que contêm valores cujos nomes conflitam com outras seções.

read_thumbnail

Quando definida para true a miniatura em si é lida. Caso contrário, apenas os dados marcados são ligos.

Valor Retornado

Retorna um array associativo onde os índices são os nomes dos cabeçalhos e os valores são os associados com esses cabeçalhos. Se nenhum dado puder ser retornado, exif_read_data() retornará false.

Erros/Exceções

Erros de nível E_WARNING e/ou E_NOTICE podem ser disparados para marcas não suportadas ou outras condições de erros potenciais, mas a função ainda tenta lêr toda a informação compreensível.

Registro de Alterações

Versão Descrição
8.0.0 required_sections agora pode ser nulo.
7.2.0 O parâmetro file agora suporta tanto arquivo localparameter now supports both local files quanto recursos de fluxo.
7.2.0

Adicionado suporte aos seguintes formatos EXIF:

  • Samsung
  • DJI
  • Panasonic
  • Sony
  • Pentax
  • Minolta
  • Sigma/Foveon
  • AGFA
  • Kyocera
  • Ricoh
  • Epson

Exemplos

Exemplo #1 Exemplo exif_read_data()

<?php
echo "test1.jpg:<br />\n";
$exif = exif_read_data('tests/test1.jpg', 'IFD0');
echo
$exif===false ? "Dados de cabeçalho não encontrados.<br />\n" : "Imagem contém cabeçalhos<br />";

$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";
}
}
?>

A primeira chamada falha porque a imagem não tem informações no cabeçalho.

O exemplo acima produzirá algo semelhante a:

test1.jpg:
Dados de cabeçalho não encontrados.
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

Exemplo #2 exif_read_data() com fluxos, disponível a partir do PHP 7.2.0

<?php
// Abre um arquivos, deve ser em modo binário
$fp = fopen('/path/to/image.jpg', 'rb');

if (!
$fp) {
echo
'Erro: Não foi possível abrir a imagem para leitura';
exit;
}

// Tenta ler o cabeçalhos exif
$headers = exif_read_data($fp);

if (!
$headers) {
echo
'Erro: Não foi possível ler os cabeçalhos exif';
exit;
}

// Mostra os cabeçalhos de 'COMPUTED'
echo 'Cabeçalhos EXIF:' . PHP_EOL;

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

O exemplo acima produzirá algo semelhante a:

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

Notas

Nota:

Se mbstring estiver habilitado, exif tentará processar em codificação unicode e escolher um conjunto de caracteres como especificado por exif.decode_unicode_motorola e exif.decode_unicode_intel. A extensão exif não tentará descobrir a codificação por si mesma, é responsabilidade do programador especificar corretamente a codificação a ser usada, configurando uma das duas diretivas ini antes de chamar exif_read_data().

Nota:

Se file for usado para passar um fluxo a esta função, o fluxo deve ser do tipo pesquisável. Note que a posição do ponteiro do arquivo não é alterada depois que esta função retorna.

Veja Também

add a note

User Contributed Notes 19 notes

up
83
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.
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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"
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6
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);
}
?>
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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";
}
}

}
?>
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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
3
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)
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0
dbareis at gmail dot com
3 hours ago
Windows fields are in a "WINXP" section (the format I don't know), but they are also elsewhere including "comments" & "subject" in null terminated "UTF-16LE" format, this code work for me:

...
$PhotoInfo->Comments = GetPhotoValueWindows16Bit($IDFO, 'Comments');
$PhotoInfo->Subject = GetPhotoValueWindows16Bit($IDFO, 'Subject');

function GetPhotoValueWindows16Bit(&$Array, $Index)
{
$Value16 = GetPhotoValue($Array, $Index);
if ($Value16 === null)
$R = null;
else
{
$R = iconv('UTF-16LE', 'UTF-8', $Value16); //Still ends in a null byte
$R = str_replace("\x00", '', $R); //Remove trailing null (but handle any).
}
return $R;
}
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0
service at tianex dot com
5 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));
//
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0
Eion Robb
9 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
11 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);
}
?>
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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.
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-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
-1
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
-3
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
-5
kurt at mandella dot biz
11 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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