exif_read_data

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

exif_read_data — Liest die EXIF-Header einer Bilddatei aus

Beschreibung

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

exif_read_data() liest die EXIF-Header aus einer Bilddatei aus. Auf diese Weise können die Metadaten ausgelesen werden, die mit Digitalkameras erzeugt wurden.

EXIF-Header kommen normalerweise bei JPEG/TIFF-Bildern vor, die von Digitalkameras gemacht wurden. Leider hat jeder Kamerahersteller eine andere Vorstellung davon, wie man die Bilder beschreibt, sodass man sich nicht darauf verlassen kann, das ein bestimmter Exif-Header vorhanden ist.

Height und Width werden genauso wie getimagesize() berechnet. Diese Werte dürfen also nicht Teil von irgendwelchen Headern sein, die zurückgegeben werden. Ferner ist html ein Höhen/Breiten-Textstring für den Gebrauch in normalem HTML.

Wenn ein Exif-Header einen Copyrightvermerk beinhaltet, kann dieser selbst aus zwei Werten bestehen. Da die Lösung im Exif-2.10 -Standard nicht konsistent ist, liefert der COMPUTED-Bereich die beiden Einträge Copyright.Photographer und Copyright.Editor, während die IFD-Bereiche aus einem Byte-Array besteht, in dem die beiden Werte durch ein NULL-Zeichen getrennt sind. Wenn der Datentyp falsch ist, ist nur der erste Eintrag vorhanden (normales Verhalten von Exif). COMPUTED beinhaltet auch einen Copyright-Eintrag. Dieser entspricht entweder dem originalen Copyright-String oder er besteht aus einer kommaseparierten Liste von Foto- und Herausgeber-Copyright.

Der Tag UserComment hat das gleiche Problem, wie das Copyright-Tag. Er kann zwei Werte speichern. Als erstes die verwendete Kodierung und als zweites den Wert selbst. Wenn dem so ist, enthält der IFD-Bereich nur die Kodierung oder ein Byte-Array. Der COMPUTED-Bereich speichert beide in den Einträgen UserCommentEncoding und UserComment. Der Eintrag UserComment ist in beiden Fällen verfügbar. Er sollte also dem Eintrag im IFD0-Bereich vorgezogen werden.

exif_read_data() validiert auch EXIF-Datentags entsprechend der EXIF-Spezifikationen (» http://exif.org/Exif2-2.PDF, Seite 20).

Parameter-Liste

file

Der Ort der Bilddatei. Dies kann entweder der Pfad der Datei (Stream-Wrapper werden wie üblich ebenso unterstützt) oder eine Stream-Ressource sein.

required_sections

Ist eine kommaseparierte Liste von Bereichen, die in der Datei vorhanden sein müssen, um das Rückgabe-Array zu erzeugen. Wenn keiner der geforderten Bereiche gefunden werden kann, wird false zurückgegeben.

FILE	FileName, FileSize, FileDateTime, SectionsFound
COMPUTED	html, Width, Height, IsColor und andere, wenn vorhanden. Height und Width werden genauso wie getimagesize() berechnet. Diese Werte dürfen also nicht Teil von irgendwelchen Headern sein, die zurückgegeben werden. Ferner ist `html` ein Höhen/Breiten-Textstring für den Gebrauch in normalem HTML.
ANY_TAG	Jegliche Informationen, die ein Tag besitzen, z. B. `IFD0`, `EXIF`, ...
IFD0	Alle IFD0-Daten mit Tag. In normalen Bilddateien beinhalten diese die Bildgröße usw.
THUMBNAIL	Wenn eine Datei ein zweites `IFD` enthält, wird angenommen, dass sie ein Miniaturbild enthält. Alle Informationen mit Tags über das eingebettete Miniaturbild werden in diesem Bereich gespeichert.
COMMENT	Kommentarheader des JPEG-Bildes.
EXIF	Der EXIF-Bereich ist ein Unterbereich von `IFD0`. Er enthält detailliertere Information über das Bild. Die meisten dieser Einträge beziehen sich auf die Digitalkamera.

as_arrays

Definiert ob jeder Bereich ein Array wird oder nicht. Die required_sections COMPUTED, THUMBNAIL und COMMENT werden immer zu Arrays, da die Namen der Werte mit denen anderer Bereiche kollidieren können.

read_thumbnail

Bei true wird das Miniaturbild ausgelesen, ansonsten nur die Daten der Tags.

Rückgabewerte

Gibt ein assoziatives Array zurück, bei dem der Arrayindex den Headernamen entspricht und der Arraywert die Werte enthält, die mit diesen Headern in Verbindung stehen. Wenn keine Daten zurückgegeben werden können, gibt exif_read_data() false zurück.

Fehler/Exceptions

Fehler der Stufe E_WARNING und/oder E_NOTICE können bei nicht unterstützten Tags oder anderen potentiellen Fehlerbedingungen ausgelöst werden, aber die Funktion versucht trotzdem, alle verständlichen Informationen zu lesen.

Changelog

Version Beschreibung

8.0.0 required_sections ist jetzt nullable (akzeptiert den null-Wert).

7.2.0 Der Parameter file unterstützt jetzt sowohl lokale Dateien als auch Stream-Ressourcen.

7.2.0

Version	Beschreibung
8.0.0	`required_sections` ist jetzt nullable (akzeptiert den `null`-Wert).
7.2.0	Der Parameter `file` unterstützt jetzt sowohl lokale Dateien als auch Stream-Ressourcen.
7.2.0	Unterstützung für folgende EXIF-Formate wurde hinzugefügt: Samsung DJI Panasonic Sony Pentax Minolta Sigma/Foveon AGFA Kyocera Ricoh Epson

Unterstützung für folgende EXIF-Formate wurde hinzugefügt:

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

Beispiele

Beispiel #1 exif_read_data()-Beispiel

<?php
echo "test1.jpg:<br />\n";
$exif = exif_read_data('tests/test1.jpg', 'IFD0');
echo $exif===false ? "Keine Headerdaten gefunden.<br />\n" : "Bild beinhaltet Header<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";
    }
}
?>

Der erste Aufruf schlägt fehl, da das Bild keine Headerinformationen enthält.

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

test1.jpg:
Keine Headerdaten gefunden.
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

Beispiel #2 exif_read_data() mit Streams; verfügbar von PHP 7.2.0 an

<?php
// Öffne die Datei im Binärmodus
$fp = fopen('/path/to/image.jpg', 'rb');

if (!$fp) {
    echo 'Fehler: Konnte das Bild nicht fürs Lesen öffnen';
    exit;
}

// Versuche die Exif-Header zu lesen
$headers = exif_read_data($fp);

if (!$headers) {
    echo 'Fehler: Konnte die Exif-Header nicht lesen';
    exit;
}

// Gib die 'COMPUTED'-Header aus
echo 'EXIF Header:' . PHP_EOL;

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

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

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

Anmerkungen

Hinweis:
Ist mbstring aktiviert, wird exif versuchen den Unicode zu verarbeiten, und einen Zeichensatz gemäß exif.decode_unicode_motorola und exif.decode_unicode_intel zu wählen. Die exif-Erweiterung versucht nicht, die Kodierung selbst zu ermitteln, so dass es die Aufgabe des Benutzers ist, die gewünschte Kodierung durch Setzen einer der beiden ini-Direktiven anzugeben, bevor exif_read_data() aufgerufen wird.

Hinweis:
Wird der Parameter file verwendet, um einen Stream an diese Funktion zu übergeben, dann muss der Stream suchbar sein. Es ist zu beachten, dass die Position des Dateizeigers nach dem Aufruf dieser Funktion unverändert ist.

Siehe auch

exif_thumbnail() - Liest das eingebettete Miniaturbild eines Bildes aus
getimagesize() - Liefert die Größe einer Grafik
Unterstützte Protokolle und Wrapper

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User Contributed Notes 19 notes

down

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.

down

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"

down

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);

}

?>

down

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.

down

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)

down

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";
        }
    }

}
?>

down

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);
            
            }
        }
    }
}

?>

down

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]);
}
?>

down

dbareis at gmail dot com ¶

5 months 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;
    }

down

service at tianex dot com ¶

10 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)

down

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));
//

down

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';
    };

down

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);

}

?>

down

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/

down

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;
}

?>

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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 ¶

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@ÿÿÿìEè€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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