Exif in php

Kamalakannan · #1 03-14-2008, 01:05 AM

Hi,

Can any one tell me use of Exif functions in php?

Jeyaseelansarc · #2 03-14-2008, 01:13 AM

Hi Kamal,
With the exif extension you are able to work with image meta data. For example, you may use exif functions to read meta data of pictures taken from digital cameras by working with information stored in the headers of the JPEG and TIFF images.

Kamalakannan · #3 03-14-2008, 01:23 AM

Hi,
Thanks. It is very interesting to know more on this exif function.
I have one small query here
do we need to enable anything in the php.ini?

Jeyaseelansarc · #4 03-14-2008, 01:26 AM

Hi Kamal,

It seems that we have to enable it individually in php.ini

To enable exif-support configure PHP with --enable-exif

Windows users must enable both the php_mbstring.dll and php_exif.dll DLL's in php.ini. The php_mbstring.dll DLL must be loaded before the php_exif.dll DLL so adjust your php.ini accordingly.

This will hellp you

Jeyaseelansarc · #5 03-14-2008, 01:39 AM

exif_imagetype
This is used to determine the type of an image and reads the first bytes of an image and checks its signature. And also it can be used to avoid calls to other exif functions with unsupported file types or in conjunction with $_SERVER['HTTP_ACCEPT'] to check whether or not the viewer is able to see a specific image in the browser.

Syntax
int exif_imagetype ( string filename )

exif_imagetype() example

PHP Code:

  <?php

if (exif_imagetype('image.gif') != IMAGETYPE_GIF) {

    echo 'The picture is not a gif';

}

?>

senraj · #6 03-14-2008, 01:55 AM

Hi jey,

I have one small query here.

if exif_imagetype you check it only GIF IMG.

Any possible to other image type is checking ?

for example PNG and TIFF images.

do you understand my question?

Jeyaseelansarc · #7 03-14-2008, 01:58 AM

Hi Sen,

As IMAGETYPE_GIF, we have the following constants are defined, and represent possible exif_imagetype() return values

IMAGETYPE_JPEG
IMAGETYPE_PNG
IMAGETYPE_SWF
IMAGETYPE_PSD
IMAGETYPE_BMP
IMAGETYPE_TIFF_II (intel byte order)
IMAGETYPE_TIFF_MM (motorola byte order)
IMAGETYPE_JPC
IMAGETYPE_JP2
IMAGETYPE_JPX
IMAGETYPE_JB2
IMAGETYPE_SWC
IMAGETYPE_IFF
IMAGETYPE_WBMP
IMAGETYPE_XBM

i think this will help you

Jeyaseelansarc · #8 03-14-2008, 02:25 AM

exif_read_data

Reads the EXIF headers from a JPEG or TIFF image file. This way you can read meta data generated by digital cameras.

Exif headers tend to be present in JPEG/TIFF images generated by digital cameras, but unfortunately each digital camera maker has a different idea of how to actually tag their images, so you can't always rely on a specific Exif header being present.

Height and Width are computed the same way getimagesize() does so their values must not be part of any header returned. Also, html is a height/width text string to be used inside normal HTML.

Validates EXIF data tags according to the EXIF specification

Syntax

array exif_read_data ( string filename ,string sections , bool arrays , bool thumbnail )

filename
The name of the image file being read. This cannot be an URL.

sections
Is a comma separated list of sections that need to be present in file to produce a result array. If none of the requested sections could be found the return value is FALSE.

arrays
Specifies whether or not each section becomes an array. The sections COMPUTED, THUMBNAIL, and COMMENT always become arrays as they may contain values whose names conflict with other sections.

thumbnail
When set to TRUE the thumbnail itself is read. Otherwise, only the tagged data is read.

exif_read_data() example

PHP Code:

  <?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";

    }

}

?>

Falcon · #9 03-14-2008, 02:49 AM

Hi Buddies

Read and Write the Exif data

Buddies this link will help us to know read and write in Exif data

PEL: PHP Exif Library

Regards
Falcon

Falcon · #10 03-14-2008, 02:52 AM

Hi Buddies

Here Some class file and example file to read and write in Exif data

It will help us..

Regards
Falcon

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