exif_read_data

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

    exif_read_data — 画像ファイルから EXIF ヘッダを読み込む

    説明

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

    exif_read_data() は、 画像ファイルから EXIF ヘッダを読み込みます。この方法で、デジタルカメラが生成したメタデータを 読み込むことが可能です。

    EXIF ヘッダは、デジタルカメラが作成した JPEG/TIFF 画像によく含まれています。しかし残念なことに、 そのタグ付けの方法はメーカーによって異なります。 したがって、特定の Exif ヘッダが常に存在すると仮定することはできません。

    Height および Width は、getimagesize() と同じ方法で計算されます。 よって、これらの値は決してヘッダの一部として返してはいけません。 また、html は高さ/幅を表すテキスト文字列で、 通常の HTML の中で用いられます。

    Exif ヘッダに著作権表示が含まれている場合、それ自身には 2 つの値を 含めることが可能です。Exif 2.10 のこの矛盾した規格に対応するため、 COMPUTED セクションは Copyright.Photographer および Copyright.Editor の両方を返します。 また IFD0 セクションには 2 つのエントリを NULL 文字で区切った バイト配列を含めます。データ型が間違っている場合は最初のエントリのみを かえします（Exif の通常の挙動）。COMPUTED には、元の著作権文字列あるいは カンマで区切られた写真と編集者の著作権表示のどちらかを Copyright エントリに含めることが可能です。

    UserComment タグにも Copyright タグと同様の問題があります。ここにも 2 つの値を格納することが可能です。それは使用しているエンコーディングと 値自身の 2 つです。そうなると、IFD セクションにはエンコーディングのみを 含めるか、あるいはバイト配列を格納することになります。COMPUTED セクションは UserCommentEncoding および UserComment を両方格納することができます。UserComment はどちらの 場合でも有効なので、IFD0 セクションではこちらを優先すべきです。

    exif_read_data() は、EXIF 仕様（» http://exif.org/Exif2-2.PDF, 20 ページ）に基づいて EXIF データタグの検証も行います。

    パラメータ

    file

    画像ファイルの位置。 ファイルのパス (ストリームラッパーもいつもどおりサポートされています) またはストリームresource。

    required_sections

    結果の配列を作成するために存在する必要のあるセクションのカンマ区切り リスト。要求されたセクションがひとつも見つからなかった場合の戻り値は false となります。

    FILE FileName, FileSize, FileDateTime, SectionsFound
    COMPUTED html, Width, Height, IsColor, および他の取得可能なもの。Height および Width は getimagesize() と同じ方法で取得した もので、その値はヘッダの一部ではありません。また、html は 通常の HTML 内で使用される height/width の 文字列です。
    ANY_TAG タグを有するすべての情報。例えば IFD0, EXIF, ...
    IFD0 IFD0 のすべてのタグつきデータ。通常の画像ファイルでは、 ここに画像のサイズが含まれます。
    THUMBNAIL 2 番目の IFD がある場合、ファイルにサムネイルが含まれている 可能性があります。埋め込まれたサムネイルに関するすべての タグつき情報はこのセクションに格納されます。
    COMMENT JPEG 画像のコメントヘッダ。
    EXIF EXIF セクションは IFD0 のサブセクションです。ここには 画像に関する詳細な情報が含まれています。これらのエントリの ほとんどはデジタルカメラに関連するものです。

    as_arrays

    各セクションを配列とするかどうかを指定します。 required_sections の COMPUTED、 THUMBNAIL および COMMENT は常に配列となります。これは、これらのセクションに 含まれる値の名前が他のセクションと衝突する可能性があるからです。

    read_thumbnail

    true を指定すると、サムネイル本体を読み込みます。それ以外の場合は タグつきデータのみを読み込みます。

    戻り値

    ヘッダ名がキー・ヘッダの内容が値となる連想配列を返します。 返されるデータがない場合は exif_read_data() は false を返します。

    エラー / 例外

    サポートされていないタグや、エラーが起きうる条件が指定された場合は、 E_WARNING かつ/または E_NOTICE が発生します。 警告が発生しても、この関数は対応する情報を全て読み取ろうとします。

    変更履歴

    バージョン 説明
    8.0.0 required_sections は、nullable になりました。
    7.2.0 file パラメータは ローカルファイルとストリームリソースを両方サポートするようになりました。
    7.2.0

    以下の EXIF フォーマットのサポートが追加されました:

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

    例

    例1 exif_read_data() の例

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

    最初のコールは失敗します。画像がヘッダ情報を有していないためです。

    上の例の出力は、 たとえば以下のようになります。

    test1.jpg:
No header data found.
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

    例2 PHP 7.2.0 で利用できるストリームを exif_read_data() で使う例

    <?php
    // Open a the file, this should be in binary mode
    $fp = fopen('/path/to/image.jpg', 'rb');

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

    // Attempt to read the exif headers
    $headers = exif_read_data($fp);

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

    // Print the 'COMPUTED' headers
    echo 'EXIF Headers:' . PHP_EOL;

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

    上の例の出力は、 たとえば以下のようになります。

    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

    注意

    注意:

    mbstring が有効な場合、 exif はUnicodeを処理し、 exif.decode_unicode_motorola および exif.decode_unicode_intel で指定された文字コードとして取り出そうとします。 exif 拡張モジュールはエンコーディングを自分自身で探そうとはしないので、 exif_read_data() を呼ぶ前に、 これらの ini ディレクティブのうちのひとつに どのエンコーディングをデコードに使うかを適切に設定するのはユーザーの責任です。

    注意:

    この関数にストリームを渡すために file を使った場合、 ストリームはシーク可能でなければなりません。 ファイルポインタの位置は、関数から戻った後でも変化しないことに注意してください。

    参考

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    User Contributed Notes 19 notes

    up
    83
    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.
    up
    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"
    up
    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);
    }
    ?>
    up
    7
    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
    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)
    up
    1
    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
    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);

    }
    }
    }
    }

    ?>
    up
    1
    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
    dbareis at gmail dot com
    6 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;
    }
    up
    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
    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));
    //
    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';
    };
    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);
    }
    ?>
    up
    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/
    up
    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
    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;
    }

    ?>
    up
    -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.
    up
    -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'];
    ?>
    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);
    }
    ＋add a note
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