[wp-trac] [WordPress Trac] #31246: Notice: Undefined offset: 0 in wp-includes/query.php on line 3877

[WordPress Trac]

#31246: Notice: Undefined offset: 0 in wp-includes/query.php on line 3877
----------------------------+-----------------------------
 Reporter:  Mediastuttgart  |      Owner:
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Query           |    Version:  4.1
 Severity:  normal          |   Keywords:
  Focuses:                  |
----------------------------+-----------------------------
 Working with a fresh wordpress 4.1 installation and only installing the
 polylang plugin, you will receive a `notice: undefined offset: 0 in wp-
 includes/query.php on line 3877` when using the language switcher and
 select "show all languages".

 The backend URL for this request is `wp-
 admin/edit.php?post_type=page&lang=all`.

 I assume this issue is not plugin related, as there maybe other scenarios
 where this issue could appear. Maybe the `$tax_query_in_and` array should
 be key-validated before trying to access its contents.

 Possible reference
 https://github.com/WordPress/WordPress/commit/7e69e5484fa350a7451403f10d50129ffed0e18a

 {{{
 Environment
 -----------

 WordPress.........: 4.1
 PHP...............: 5.5.10 (Darwin 14.0.0 Darwin Kernel Version 14.0.0:
 Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64 x86_64)
 Database..........: mysql (v5.5.34)
 Webserver.........: Apache
 User Agent........: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1)
 AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.94 Safari/537.36

 PHP-Settings
 ------------

 register_globals..: disabled
 magic_quotes_gpc..: disabled
 safe_mode.........: disabled
 error_reporting...: E_ALL
 max_execution_time: 240 Seconds
 memory_limit......: 128,00 MBytes
 Extensions........: apache2handler, apc, apcu, bcmath, bz2, calendar, Core
                     ctype, curl, date, dom, ereg, exif, fileinfo
                     filter, ftp, gd, gettext, hash, iconv, imap
                     intl, json, ldap, libxml, mbstring, mcrypt, mysql
                     mysqli, openssl, pcre, PDO, pdo_mysql, pdo_pgsql,
 pdo_sqlite
                     pgsql, Phar, posix, Reflection, session, SimpleXML,
 soap
                     sockets, SPL, sqlite3, standard, tokenizer, xml,
 xmlreader
                     xmlwriter, xsl, yaz, zip, zlib

 Plugins
 -------

 polylang            (1.6.4)
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/31246>
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