exif_read_data

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

exif_read_dataLee los encabezados EXIF en las imágenes

Descripción

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

exif_read_data() lee los encabezados EXIF de las imágenes. Con esta función, se pueden leer los datos meta generados por las cámaras digitales.

Los encabezados EXIF tienden a estar presentes en las imágenes JPEG/TIFF generadas por las cámaras digitales, pero desafortunadamente, cada cámara digital tiene una idea diferente de cómo sus imágenes deben ser marcadas, por lo que no siempre se puede contar con un encabezado EXIF específico, aunque esté presente.

Los parámetros Height y Width se calculan de la misma manera que para la función getimagesize(), por lo que sus valores no formarán parte de ningún encabezado devuelto. De igual manera, el índice html es la representación textual de la altura/ancho utilizada en una etiqueta de imagen HTML clásica.

Cuando un encabezado EXIF contiene una nota de Copyright, este encabezado puede contener a su vez dos valores. Como esta solución es inconsistente con los estándares EXIF 2.10, la sección COMPUTED devolverá los dos encabezados, Copyright.Photographer y Copyright.Editor, mientras que las secciones IFD0 contienen el array de bytes con caracteres NULL para separar las dos entradas; o bien, solo la primera entrada si el tipo de datos era incorrecto (comportamiento por defecto de EXIF). La sección COMPUTED también contendrá una entrada Copyright, que será ya sea la cadena original de copyright, o una lista de valores separados por comas de fotos y copyright del autor.

La etiqueta UserComment presenta el mismo problema que la etiqueta Copyright. Puede almacenar dos valores: primero, el juego de caracteres utilizado, luego el valor en sí. Si es así, la sección IFD contendrá solo el juego de caracteres, o un array de bytes. La sección COMPUTED almacenará las dos entradas UserCommentEncoding y UserComment. El índice UserComment está disponible en ambos casos, y es preferible usarlo, en lugar del valor de la sección IFD0.

exif_read_data() valida los datos de las etiquetas EXIF de acuerdo con la especificación EXIF (» http://exif.org/Exif2-2.PDF, página 20).

Parámetros

file

La ubicación del archivo de imagen. Puede ser ya sea una ruta de acceso al archivo (los wrappers de flujo también son soportados como de costumbre), o un flujo resource.

required_sections

Lista de valores separados por comas de las secciones que deben presentarse en el array de resultado. Si ninguna de las secciones solicitadas se encuentra, el valor devuelto es false.

FILE FileName (nombre del archivo), FileSize (tamaño del archivo), FileDateTime (fecha de modificación del archivo), SectionsFound (secciones encontradas)
COMPUTED Atributo Html, ancho, altura, color o blanco y negro y más si está disponible. El ancho y la altura se calculan de la misma manera que la función getimagesize(), por lo que sus valores nunca deberían diferir. De igual manera, el índice html es la representación textual de la altura/ancho utilizada en una etiqueta de imagen HTML clásica.
ANY_TAG Toda la información concerniente a esta etiqueta, como IFD0, EXIF, ...
IFD0 Todas las etiquetas IFD0. En imágenes normales, contienen las dimensiones de la imagen, etc.
THUMBNAIL Un archivo que contiene una miniatura, si hay un segundo IFD. Toda la información etiquetada sobre esta miniatura será almacenada en esta sección.
COMMENT Encabezado de comentario de las imágenes JPEG.
EXIF La sección EXIF es una subsección de la sección IFD0. Ella contiene información más detallada sobre las imágenes. La mayoría de estos índices están relacionados con las cámaras digitales.

as_arrays

Especifica si cada sección debe convertirse en un array o no. Las required_sections COMPUTED, THUMBNAIL y COMMENT siempre serán convertidas en arrays, ya que contienen nombres que podrían entrar en conflicto.

read_thumbnail

Cuando se define como true, la miniatura misma es leída. De lo contrario, solo se leen los datos contenidos en el archivo.

Valores devueltos

Devuelve un array asociativo donde los índices son los nombres de los encabezados y los valores son los valores asociados a estos encabezados. Si no se puede devolver ningún dato, exif_read_data() devolverá false.

Errores/Excepciones

Pueden generarse errores de nivel E_WARNING y/o E_NOTICE para etiquetas no soportadas u otras condiciones de error potencial, pero la función intenta leer toda la información comprensible.

Historial de cambios

Versión Descripción
8.0.0 required_sections ahora es nullable.
7.2.0

Se ha añadido el soporte para los siguientes formatos EXIF:

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

Ejemplos

Ejemplo #1 Ejemplo con exif_read_data()

<?php
echo "test1.jpg:<br />\n";
$exif = exif_read_data('tests/test1.jpg', 'IFD0');
echo
$exif===false ? "No se encontraron encabezados de datos.<br />\n" : "La imagen contiene encabezados<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";
}
}
?>

La primera llamada falla porque la imagen no tiene encabezado de información.

El resultado del ejemplo sería algo similar a:

test1.jpg:
No se encontraron encabezados de datos.
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

Ejemplo #2 exif_read_data() con flujos disponibles desde PHP 7.2.0

<?php
// Abrir el archivo, esto debería ser en modo binario
$fp = fopen('/path/to/image.jpg', 'rb');

if (!
$fp) {
echo
'Error: No se pudo abrir la imagen para lectura';
exit;
}

// Intentar leer los encabezados EXIF
$headers = exif_read_data($fp);

if (!
$headers) {
echo
'Error: No se pudieron leer los encabezados exif';
exit;
}

// Mostrar los encabezados 'COMPUTED'
echo 'EXIF Headers:' . PHP_EOL;

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

El resultado del ejemplo sería algo similar a:

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

Notas

Nota:

Si mbstring está activado, EXIF intentará tratar el Unicode y elegir un juego de caracteres como se especifica por exif.decode_unicode_motorola y exif.decode_unicode_intel. La extensión EXIF no intentará determinar el codificado por sí misma, y es responsabilidad del usuario especificar correctamente el codificado a usar para el decodificado definiendo una de las dos directivas INI antes de llamar a exif_read_data().

Nota:

Si el parámetro file se usa para pasar un flujo a la función, entonces el flujo debe ser reposicionable. Tenga en cuenta que la posición del puntero de un archivo no se modifica después del retorno de esta función.

Ver también

add a note

User Contributed Notes 19 notes

up
81
chadsmith729 at gmail dot com
12 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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3
Tim
5 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
16 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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7
drpain at webster dot org dot za
13 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.
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4
mafo at mafo removethis dot sk
17 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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1
omerg at lucidcode dot com dot tr
6 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
1
TNTcode
7 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);

}
}
}
}

?>
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1
b at asdflolinternet dot de
9 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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1
Eion Robb
10 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]);
}
?>
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0
dbareis at gmail dot com
1 year 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
1 year 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
Clive dot Moore at ma-design dot com
11 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';
};
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0
hoangvu4000 at gmail dot com
12 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
16 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
18 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
11 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;
}

?>
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-1
wdierkes at 5dollarwhitebox dot org
17 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.
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-3
lincolnzsilva at gmail dot com
16 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'];
?>
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-5
kurt at mandella dot biz
12 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—Ïàôɿ׬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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