exif_read_data()

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

从JPEG或TIFF文件中读取EXIF头信息

说明

exif_read_data(string $filename[,string $sections= NULL[,bool $arrays= false[,bool $thumbnail= false]]]): array

exif_read_data()函数从JPEG或TIFF图像文件中读取EXIF头信息。这样就可以读取数码相机产生的元数据。

EXIF头信息往往存在于数码相机生成的 JPEG/TIFF 图像中，但不幸的是每个数码相机制造商的标记都不同，因此（编写代码时）不能依赖于某个特定的 Exif 头信息。

Height 和 Width 是用和getimagesize()一样的方法计算的，因此它们的值不能是任何返回的头信息的部分。此外 html 是一个 height/width 的文本字符串可以用于普通的HTML中。

当一个 Exif 头信息包含有一个 Copyright 时注意它本身可以包含两个值。解决方案和 Exif 2.10 标准不一致，COMPUTED 区段会同时返回 Copyright.Photographer 和 Copyright.Editor，但是 IFD0 区段则包含有一个字节数组用 NULL 字符分隔开两个项目。或者只有第一项如果数据类型错误的话（Exif 的正常行为）。COMPUTED 也会包含 Copyright，要么是原始的版权字符串，要么是逗号分隔的摄像与编辑的版权信息。

UserComment 标记和 Copyright 有同样的问题。它也可以存储两个值，第一个是使用的编码方式，第二个是其值本身。如果这样则 IFD0 区段仅包含编码方式或者一个字节数组。COMPUTED 区段将存储两个值到 UserCommentEncoding 和 UserComment。UserComment 在两种情况下都可用因此应该优先使用它而不是 IFD0 区段中的该值。

exif_read_data()还会根据 EXIF 规范（» http://exif.org/Exif2-2.PDF，第 20 页）来验证 EXIF 数据。

Note:

Windows ME/XP 在连接到数码相机时能清除掉 Exif 头信息。

参数

$filename

被读取的图像文件名。不能是URL。

$sections

是需要存在于文件中的逗号分隔的区段列表用来产生结果数组。如果未找到所请求的区段则返回值为FALSE。

FILE	FileName, FileSize, FileDateTime, SectionsFound
COMPUTED	html，Width，Height，IsColor，可能有更多其它的。Height 和 Width 是用和getimagesize()一样的方法计算的，因此它们的值不能是任何返回的头信息的部分。此外 html 是一个 height/width 的文本字符串可以用于普通的HTML中。
ANY_TAG	任何包含有标记的信息，例如 IFD0，EXIF，...
IFD0	所有 IFD0 的标记数据。在标准的图像文件中这包含了图像大小及其它。
THUMBNAIL	如果有第二个 IFD，文件应该包含有缩略图。所有有关嵌入缩略图的标记信息都存储在本区。
COMMENT	JPEG 图像的注释头信息。
EXIF	EXIF 区段是 IFDO 的子区，包含有图像的更多详细信息。大多数内容都是数码相机相关的。

$arrays

指定了是否每个区段都成为一个数组。$sectionsCOMPUTED，THUMBNAIL和COMMENT区段总是成为数组，因为它们里面包含的名字和其它区段冲突。

$thumbnail

当设定为TRUE时，读取缩略图本身。否则只读取标记数据。

返回值

返回一个关联数组，键名是头信息名，值为与其相应的值。如果没有可供返回的数据，exif_read_data()将返回FALSE。

更新日志

范例

exif_read_data()例子

<?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";
    }
}
?>

第一个调用失败了，因为图像没有头信息。

以上例程的输出类似于：

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

参见

• exif_thumbnail()取得嵌入在 TIFF 或 JPEG 图像中的缩略图
• getimagesize()取得图像大小

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.

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);
}
?>

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.

Problem with "Some Text" 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));
//

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]);
}
?>

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"

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";
    }
  }
}
?>

<?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);
      
      }
    }
  }
}
?>

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/

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'];
?>

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';
  };

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)

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.

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;
}
?>

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);
}
?>

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.

Photos processed in Picasa often contain garbage data in the "MAKERNOTE" section and under EXIF.MakerNote, (UTF8) like:
[MakerNote] => \x19\3\6r\5\1\30~\5\2\3\4Þ\5\3\3\4æ\5\4\3"î\5\6\2\x1d2\6\7\2\x16O\6\x08\4\1Ôy\x0f  \2 e\6 \4§…\6\x10\4\1b\2\x13\3\4!  \x18\1\1)  \x19\3\1\1\x1c\3\1\x1d\3\x10) \x1e\4\1\3\1\x1f\3EI "\3ÐÓ
#\4\2s\f&\30{\f'\3\5Û\f(\1\x10å\f-\4\1Ð\4\1`\2\3\5\4ÿÿ\1\x0f\3\1\6@ÿÿÿìE\f\x17è\3€Ýÿÿ\1\1 \x0f \x0fÿÿÿÿÿÿx\2 "ú»Dóÿ H\1 ?\1\2\1.\2}B\1\4úIMG:DIGITAL IXUS 100 IS JPEGFirmware Version 1.00\5s\1›\1x\1Ç\3Øÿÿÿ–\2l\3¥ÿÿÿ\2\f\f\x08\x0e\v Ø\3Ì\3Ì\3x\1Œ\4 ÿÿÌ\3Ì\3\6\2\5Ÿ\4\4ãÿÿÿ¼Ž(½\4\4\4\5\f(½T‹\3U\6’\6‹\3d\1–\2~\3Ø\3“\2¥ÿÿÿ  Àÿ\1œ\1\3ª\1ã\1j\2á\2À\x10pg\1a\1X\1f\1a\1W\1b\1[\1T\1e\1«
8\5ú5\1:\5\4Áð-\3\3\23åÿÿ\x195»ÿ\1\2 ‹;ßÊ \1\2\2\2\2Š\1\4\x08 \1\x10\x08\1\1€\2à\1\x08€\1\x08`\4     \x0f¸\vdd\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12\x12îÿ\x12îÿ\x12îÿ\x12îÿîÿîÿ\x12\x12\x12\1
ÿÿ\eŠ1—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);
}