testet too with: PHP 7.1.0-dev (cli) (built: Mar 18 2016 09:01:15) ( NTS )

the three keys delivered within $info are:
- APP0 (value starts with JFIF..)
- APP1 (value starts with Exif..)
- APP15 (Value starts with EditDetection..)

Can you provide a jpeg that can be used to replicate this bug?

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.

The bug is still ocurring, in all PHP versions, so it should be reopened. Here is a simple test case (script posted, output posted, sample jpg images on Google Drive):

Test file (test.php):

<?php
var_dump(getimagesize('17342761-mobileupload_d5f239209ef5cf6_3426572_20170617_103722.jpg'));
var_dump(getimagesize('17342761-mobileupload_d5f239209ef5cf6_3426572_20170617_103722.jpg', $imageinfo));
var_dump($imageinfo);

var_dump(getimagesize('17342761-mobileupload_d5f239209ef5cf6_2474645_20170617_110134.jpg'));
var_dump(getimagesize('17342761-mobileupload_d5f239209ef5cf6_2474645_20170617_110134.jpg', $imageinfo));
var_dump($imageinfo);
?>

Output:

$ php test.php
test.php:2:
array(7) {
  [0] =>
  int(4032)
  [1] =>
  int(3024)
  [2] =>
  int(2)
  [3] =>
  string(26) "width="4032" height="3024"" 
  'bits' =>
  int(8)
  'channels' =>
  int(3)
  'mime' =>
  string(10) "image/jpeg" 
}
test.php:3:
bool(false)
test.php:4:
array(1) {
  'APP1' =>
\000\000
\000
\000\000\000�\000\000

\000
\000\000\000�
                                                         \000\000
\00\000\000\000�\000\000\000
\000    \000\000\000�\000\000\000
\000
\000\000\000
\000\000\000
\000
\000\000\000�\000\000\000
\000
\000\000\000�\000\000\000(
\000
\000\000\000\000\000\0001
\000\000\000\000�\000\000\0002
\000\000\000\000�\000\000\000\000
\000\000\000
\000\000\000i�\000
\000\000\000�\000\000\000%�\000
\000\000\000�\000\000�\000\000samsung\000SM-G935V\000\000H\000\000\000
\"...
}
test.php:6:
array(7) {
  [0] =>
  int(4032)
  [1] =>
  int(3024)
  [2] =>
  int(2)
  [3] =>
  string(26) "width="4032" height="3024"" 
  'bits' =>
  int(8)
  'channels' =>
  int(3)
  'mime' =>
  string(10) "image/jpeg" 
}
test.php:7:
bool(false)
test.php:8:
array(1) {
  'APP1' =>
\000\000
\000
\000\000\000�\000\000

\000
\000\000\000�
                                                         \000\000
\00\000\000\000�\000\000\000
\000    \000\000\000�\000\000\000
\000
\000\000\000
\000\000\000
\000
\000\000\000�\000\000\000
\000
\000\000\000�\000\000\000(
\000
\000\000\000\000\000\0001
\000\000\000\000�\000\000\0002
\000\000\000\000�\000\000\000\000
\000\000\000
\000\000\000i�\000
\000\000\000�\000\000\000%�\000
\000\000\000�\000\000�\000\000samsung\000SM-G935V\000\000H\000\000\000
\"...
}

JPG images to test with:

https://drive.google.com/file/d/0B9eJ8bp6Y-f0c3N2b0hycDBPaFU/view?usp=sharing
https://drive.google.com/file/d/0B9eJ8bp6Y-f0WFhaTDBLSXdWTlk/view?usp=sharing

One workaround is to use exif_read_data() in this case, i.e. the code would become:

<?php
var_dump(getimagesize('17342761-mobileupload_d5f239209ef5cf6_3426572_20170617_103722.jpg'));
getimagesize('17342761-mobileupload_d5f239209ef5cf6_3426572_20170617_103722.jpg', $imageinfo);

$exif = exif_read_data('17342761-mobileupload_d5f239209ef5cf6_3426572_20170617_103722.jpg', 'IFD0');
if ($exif !== false) {
    var_dump($exif);
} else {
    var_dump(getimagesize('17342761-mobileupload_d5f239209ef5cf6_3426572_20170617_103722.jpg', $imageinfo));
    var_dump($imageinfo);
}

var_dump(getimagesize('img130912-2.1.jpg'));
$exif = exif_read_data('img130912-2.1.jpg', 'IFD0');
if ($exif !== false) {
    var_dump($exif);
} else {
    var_dump(getimagesize('img130912-2.1.jpg', $imageinfo));
    var_dump($imageinfo);
}
?>

but this is clearly a bug, either in PHP or in the underlying gd layer.

Thanks for the images, freecorvette!  It seems to me there are
multiple not directly related issues.

Firstly, php_read_APP()[1] fails for empty APP segments, but the first
image contains an empty APP5 segment (starting at byte 430D).  I am
not sure whether empty APP segments are allowed according to the 
specification, but at least we could accept them.  It is not clear,
however, if we should add them to the $info with an empty string value,
or simply omit them.

Secondly, the check whether php_stream_read() succeeded[2] appears to
be wrong.  We should check whether it returned `length` – otherwise
we're likely putting garbage from the buffer into the markers value a
few lines below.  Fixing this would also fix the first issue, adding
the empty APP segment to $info with an empty string value.

Thirdly, if php_handle_jpeg()[3] fails, it may nonetheless have
already added entries to `info`, which might better be removed
(perhaps we should even null `info`).

[1] <https://github.com/php/php-src/blob/PHP-7.2.4/ext/standard/image.c#L441>
[2] <https://github.com/php/php-src/blob/PHP-7.2.4/ext/standard/image.c#L456>
[3] <https://github.com/php/php-src/blob/PHP-7.2.4/ext/standard/image.c#L475>

<https://github.com/php/php-src/pull/3319> should solve this issue.