Other examples from other cameras:
http://bohwaz.net/photos/2014/02-fevrier/p20140219_193908.jpg (Panasonic Lumix GF5)
http://bohwaz.net/photos/2014/01-janvier/p20140117_080901.jpg (Nokia E7 phone)
http://bohwaz.net/photos/2014/01-janvier/12-Val_Suzon/p20140112_140758.jpg (Fujifilm HS20 EXR)

(Continued, as antispam forbids me from posting too many URLs)

with different errors, or sometimes no error, but still no thumbnail:

$ php -r 'var_dump(strlen(exif_thumbnail("http://bohwaz.net/photos/2014/02-fevrier/p20140219_193908.jpg")));'
int(0)

$ php -r 'var_dump(strlen(exif_thumbnail("http://bohwaz.net/photos/2014/01-janvier/p20140117_080901.jpg")));'                                                                                                                                                         
int(0)

$ php -r 'var_dump(strlen(exif_thumbnail("http://bohwaz.net/photos/2014/01-janvier/12-Val_Suzon/p20140112_140758.jpg")));'                                                                                                                                               
PHP Warning:  exif_thumbnail(p20140112_140758.jpg): corrupt EXIF header: maximum directory nesting level reached in Command line code on line 1

Warning: exif_thumbnail(p20140112_140758.jpg): corrupt EXIF header: maximum directory nesting level reached in Command line code on line 1
int(0)

This appears to be a duplicate of bug #72735, which has been fixed
as of PHP 5.6.25. Please try this version.

Yup I saw that bug but the patch seems to only affect Samsung photos, and my problem happens with every photo I tried, so not sure how that patch would affect this issue.

In any case I will try with the git branch next week just to be sure.

I've just checked the first image with PHP 5.6.24 and with the
current head of the PHP-5.6 branch. The former gives `int(0)`,
the latter `int(21004)`, so indeed the issue appears to have been
fixed.

It was working on a 5.x release also... then it stopped after an Ubuntu update ... so I decided to go to v7 and Ubuntu 16.04 thinking the bug would be fixed... but apparently not.. or I am missing some other dependency.

 ...source... 
$file='IMG_4741.JPG';
$image = exif_thumbnail($file, $width, $height, $type);
echo "length is :" . strlen($image);

 ... output and error message ...
PHP Warning:  exif_thumbnail(IMG_4741.JPG): IFD data bad offset: 0xFFFFFCF2 length 0x0ED8 in .../example1.php on line 3
length is :0 ...

 ... php -v ...
PHP 7.0.8-0ubuntu0.16.04.2 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.8-0ubuntu0.16.04.2, Copyright (c) 1999-2016, by Zend Technologies

 ... uname -a ...
Linux ... 4.4.0-34-generic #53-Ubuntu SMP Wed Jul 27 16:06:28 UTC 2016 i686 i686 i686 GNU/Linux

No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.

72735 was fixed in PHP 7.0.10. To test with the 7.0 series you need to use at least that version.

Bug #72914 and I can both reproduce in 5.6.25.

@cmb, I see one commit that fixes 72735 and it looks like it's only in master.
https://github.com/php/php-src/commit/9c8c37854efe843e45228597837fc4b6aac59113
But @welting updated NEWS saying it's fixed in 5.6.25, 7.0.10, and 7.1.0beta3?

Indeed, Kalle's commit[1] is only in master, but there may have
been another commit that fixed the issue. Not sure.

Anyhow, I can confirm that this report and also bug 72914 are not
resolved with PHP 5.6.25. bug 72914 would be resolved with current
master; however, this very issue not.

@kalle Can you please have a look at these issues?

[1] <https://github.com/php/php-src/commit/9c8c3785>

@cmb I have been fairly busy with some personal life things and moving in the past week or so, and it might continue and with Legion's release coming soon I'm not sure how much time I have, but in the case I do not something within a week or two, then please see if you can sync 5.6/7.0/7.1 with master

php -v && php -r 'var_dump(strlen(exif_thumbnail("http://www.exiv2.org/include/img_1771.jpg")));'
PHP 5.4.45-0+deb7u5 (cli) (built: Aug 30 2016 20:15:34) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
PHP Warning:  exif_thumbnail(img_1771.jpg): IFD data bad offset: 0xFFFFFC52 length 0x01C2 in Command line code on line 1
int(0)

Same issue on Mac OS X 10.9.5 on PHP 5.6.29. I'm sure it's been around for about as long. PHP installed via MacPorts.


$ php -v && php -r 'var_dump(strlen(exif_thumbnail("http://www.exiv2.org/include/img_1771.jpg")));'

PHP 5.6.29 (cli) (built: Dec 10 2016 15:52:37) 
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

Warning: exif_thumbnail(img_1771.jpg): IFD data bad offset: 0xFFFFFC52 length 0x01C2 in Command line code on line 1
int(0)

Same for PHP 7.0.14:

$ php -v && php -r 'var_dump(strlen(exif_thumbnail("http://www.exiv2.org/include/img_1771.jpg")));'

PHP 7.0.14-2+deb.sury.org~xenial+1 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.14-2+deb.sury.org~xenial+1, Copyright (c) 1999-2016, by Zend Technologies

PHP Warning:  exif_thumbnail(img_1771.jpg): IFD data bad offset: 0xFFFFFC52 length 0x01C2 in Command line code on line 1
int(0)

Still the same on 5.6.30 (freebsd):
 php -v && php -r 'var_dump(strlen(exif_thumbnail("http://www.exiv2.org/include/img_1771.jpg")));'
PHP 5.6.30 (cli) (built: Jan 21 2017 01:17:54) 
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
PHP Warning:  exif_thumbnail(img_1771.jpg): IFD data bad offset: 0xFFFFFC52 length 0x01C2 in Command line code on line 1
int(0)

This is pretty ridiculous that it is still around. I will try to revert back to 5.4!

Here is the log for the latest that I tried:
PHP 7.1.1 (cli) (built: Feb 13 2017 10:05:49) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.1.1, Copyright (c) 1999-2017, by Zend Technologies
    with Xdebug v2.5.0, Copyright (c) 2002-2016, by Derick Rethans
PHP Warning:  exif_thumbnail(img_1771.jpg): IFD data bad offset: 0xFFFFFC52 length 0x01C2 in Command line code on line 1
PHP Stack trace:
PHP   1. {main}() Command line code:0
PHP   2. exif_thumbnail() Command line code:1

Warning: exif_thumbnail(img_1771.jpg): IFD data bad offset: 0xFFFFFC52 length 0x01C2 in Command line code on line 1

Call Stack:
    0.0001     348240   1. {main}() Command line code:0
    0.0001     348240   2. exif_thumbnail() Command line code:1

Command line code:1:
int(0)

Still getting this error on 7.0.15... any more info needed from my config?

----  attributes of image file  ----

-rwxrwxrwx 1 root root 2839434 Mar 31  2013 IMG_4741.JPG*


----  source php script  ----

<?php
$file='IMG_4741.JPG';
$image = exif_thumbnail($file, $width, $height, $type);
echo "length is :" . strlen($image);
?>


----  output of running the script  ----


php phpBug.php

PHP Warning:  exif_thumbnail(IMG_4741.JPG): IFD data bad offset: 0xFFFFFCF2 length 0x0ED8 in /home/crberry/familyarchive/php/phpBug.php on line 3
length is :0

----

php -v

PHP 7.0.15-0ubuntu0.16.04.4 (cli) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.0.15-0ubuntu0.16.04.4, Copyright (c) 1999-2017, by Zend Technologies

----

uname -a

Linux crberry-ThinkPad-R50e 4.4.0-66-generic #87-Ubuntu SMP Fri Mar 3 15:27:09 UTC 2017 i686 i686 i686 GNU/Linux

Still broken in PHP 5.6.30 :(

$ php -v && php -r 'var_dump(strlen(exif_thumbnail("http://www.exiv2.org/include/img_1771.jpg")));'
PHP 5.6.30-0+deb8u1 (cli) (built: Feb  8 2017 08:50:21) 
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
PHP Warning:  exif_thumbnail(img_1771.jpg): IFD data bad offset: 0xFFFFFC52 length 0x01C2 in Command line code on line 1

Warning: exif_thumbnail(img_1771.jpg): IFD data bad offset: 0xFFFFFC52 length 0x01C2 in Command line code on line 1
int(0)

The fix for this bug has been committed.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.

 For Windows:

http://windows.php.net/snapshots/
 
Thank you for the report, and for helping us make PHP better.

Finally, thank you so much :)

Could we get that merged in old PHP versions as well? Like PHP 5.6 and 7.0 and 7.1?

Thanks :)

I will see if I can merge the changes to lower branches, but sadly there are quite a few that all build on each other so I will have to check with the RMs if its possible

Thanks for helping to make PHP even greater!

Sure, no worries if it's just impossible or too hard.

I tried to fix that bug a few months earlier but I didn't have enough knowledge of how EXIF worked to be able to fix it. So thanks :)

BTW I compiled and tested your patch and all my files that were failing are now working. So far so good!

Awesome! Thank you very much for testing, keep reporting bugs if more should occur, I put myself as a maintainer of the EXIF extension, at least for now :)

I also added a lot more new MARKERNOTE formats to the base extension, like Sony

php7 is the default in Ubuntu 16.04 .. will the fix find it's way over to PHP 7.0.18-0ubuntu0.16.04.1 and the Ubuntu repos?  or should I start working on rolling back to v5