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[Launchpad Bug Tracker <1674892@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package php7.0 - 7.0.18-0ubuntu0.16.04.1

---------------
php7.0 (7.0.18-0ubuntu0.16.04.1) xenial; urgency=medium

  * New upstream release 7.0.18
    - LP: #1686237
    - LP: #1674892
    - Refresh patches for new upstream release
  * Drop:
    - debian/patches/0053-Fix-pdo_pgsql.patch: Fixed #73959 - lastInsertId
      fails to throw an exception in pdsql.  Thanks to andrewnester
      <andrew.nester.dev@xxxxxxxxx>.  Closes LP #1658289.
      [ Fixed upstream in 7.0.16, prior changelog referred to wrong
        patchfile ]
    - SECURITY REGRESSION: large mysql requests broken (LP #1668017)
      + debian/patches/fix_74021.patch: fix fetch_array with more than
        MEDIUMBLOB in ext/mysqlnd/mysqlnd_wireprotocol.c, added tests to
        ext/mysqli/tests/bug73800.phpt, ext/mysqli/tests/bug74021.phpt.
      [ Fixed upstream in 7.0.17 ]
  * d/control{,.in}: Backport "libapache2-mod-phpX.Y now recommends
    apache2 package (as this is what most people want anyway)" from
    Debian 8.0.7-3 (LP: #1689646).

 -- Nishanth Aravamudan <nish.aravamudan@xxxxxxxxxxxxx>  Wed, 10 May
2017 09:19:03 -0700

** Changed in: php7.0 (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1674892

Title:
  zend_print_flat_zval_r doesn't consider reference

Status in php7.0 package in Ubuntu:
  Fix Released
Status in php7.0 source package in Xenial:
  Fix Released
Status in php7.0 source package in Yakkety:
  Fix Released
Status in php7.0 source package in Zesty:
  Fix Released
Status in php7.0 source package in Artful:
  Fix Released

Bug description:
  [Impact]

   * Users hit an error with PHP7.0 when zend_print_flat_zval_r doesn't
  consider a reference.

  The following error may be triggered：
  PHP Notice:  Array to string conversion;
  Catchable fatal error: Object could not be converted to string.

  [Test Case]

   * From the upstream bug:

  $a = array('a');
  class b{};
  $b = new b;
  $test[] =& $a;
  $test[] =& $b;
  test($test);
  function test() {
      debug_print_backtrace();
  }

  Expected result:
  ----------------
  #0  test(Array ([0] => Array ([0] => a),[1] => b Object ())) called at [/Users/playcrab/Documents/code/php/test/test7.php:7]

  Actual result:
  --------------
  #0  test(Array ([0] => PHP Notice:  Array to string conversion in /Users/playcrab/Documents/code/php/test/test7.php on line 9
  PHP Stack trace:
  PHP   1. {main}() /Users/playcrab/Documents/code/php/test/test7.php:0
  PHP   2. test() /Users/playcrab/Documents/code/php/test/test7.php:7
  PHP   3. debug_print_backtrace() /Users/playcrab/Documents/code/php/test/test7.php:9
  PHP Catchable fatal error:  Object of class b could not be converted to string in /Users/playcrab/Documents/code/php/test/test7.php on line 9
  PHP Stack trace:
  PHP   1. {main}() /Users/playcrab/Documents/code/php/test/test7.php:0
  PHP   2. test() /Users/playcrab/Documents/code/php/test/test7.php:7
  PHP   3. debug_print_backtrace() /Users/playcrab/Documents/code/php/test/test7.php:9

  Notice: Array to string conversion in
  /Users/playcrab/Documents/code/php/test/test7.php on line 9

  Call Stack:
      0.0068     353088   1. {main}() /Users/playcrab/Documents/code/php/test/test7.php:0
      0.0080     353928   2. test() /Users/playcrab/Documents/code/php/test/test7.php:7
      0.0080     353928   3. debug_print_backtrace() /Users/playcrab/Documents/code/php/test/test7.php:9

  Array,[1] => 
  Catchable fatal error: Object of class b could not be converted to string in /Users/playcrab/Documents/code/php/test/test7.php on line 9

  Call Stack:
      0.0068     353088   1. {main}() /Users/playcrab/Documents/code/php/test/test7.php:0
      0.0080     353928   2. test() /Users/playcrab/Documents/code/php/test/test7.php:7
      0.0080     353928   3. debug_print_backtrace() /Users/playcrab/Documents/code/php/test/test7.php:9

  
  [Regression Potential]

   * I believe the regression potential is low to zero for this fix (via
  7.0.18 upstream). The reason is that the code as-is in 16.04 does not
  work and leads to backtraces. The fix introduce upstream resolves the
  issue.

  ---

  https://bugs.php.net/bug.php?id=73916

  We've hit this bug in 7.0.15, the current/latest version for Xenial.

  It was fixed in 7.0.16 by php.net, Feb 16 2017. It would be nice if
  Xenials packages would be updated to reflect this fix.

  Patch: http://git.php.net/?p=php-
  src.git;a=blobdiff;f=Zend/zend.c;h=2a47e9244ba787a2ad35e9220171b04d1a5de634;hp=3f3ca75e382b1dec98fd138307d812f36f02251e;hb=04379bcb1df25a9f9cc1d440f5c12105b9fbaf97;hpb=bd75f9e61375c7632bb55b0d49b470ecd94e8ec7

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