Title: 3.1 RC2 – Invalid argument supplied for foreach()
Last modified: August 19, 2016

---

# 3.1 RC2 – Invalid argument supplied for foreach()

 *  [Steve](https://wordpress.org/support/users/steveatty/)
 * (@steveatty)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/)
 * I just upgraded to RC2 and I’m getting a huge number of PHP warnings – all telling
   me:
 * `Invalid argument supplied for foreach() in /webstuff/canalblogs/wp-includes/
   functions.php on line 3064`
 * line 3064 is `foreach ( $list as $key => $obj ) {` in the wp_list_filter function

Viewing 9 replies - 1 through 9 (of 9 total)

 *  [Andrew Nacin](https://wordpress.org/support/users/nacin/)
 * (@nacin)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841400)
 * Hi Steve,
 * We know what would cause an error like this, but not what piece of code in particular
   is causing this.
 * It might be a plugin. Think you could deactivate them? You may also wish to switch
   to the default theme momentarily.
 * I’d love to nail down what code in particular is causing this, that way we can
   prevent this, and to confirm that this wasn’t a regression from 3.0.
 * At worst, we can run what’s called a backtrace to identify exactly where this
   is coming from. Actually, we can potentially even start there. Just add this 
   immediately before line 3064:
 *     ```
       if ( ! is_array( $list ) ) {
           echo '<pre>';
           var_dump( $list );
           var_dump( debug_backtrace() );
           die();
       }
       ```
   
 * This should give us a pretty good idea of what is causing this.
 * Thanks,
    Nacin
 *  Thread Starter [Steve](https://wordpress.org/support/users/steveatty/)
 * (@steveatty)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841412)
 * I’ve got a back trace:
 *     ```
       NULL
       array(12) {
         [0]=>
         array(4) {
           ["file"]=>
           string(46) "/webstuff/canalblogs/wp-includes/functions.php"
           ["line"]=>
           int(3037)
           ["function"]=>
           string(14) "wp_list_filter"
           ["args"]=>
           array(3) {
             [0]=>
             &NULL
             [1]=>
             &array(1) {
               ["_builtin"]=>
               bool(false)
             }
             [2]=>
             &string(3) "and"
           }
         }
         [1]=>
         array(4) {
           ["file"]=>
           string(41) "/webstuff/canalblogs/wp-includes/post.php"
           ["line"]=>
           int(835)
           ["function"]=>
           string(21) "wp_filter_object_list"
           ["args"]=>
           array(4) {
             [0]=>
             &NULL
             [1]=>
             &array(1) {
               ["_builtin"]=>
               bool(false)
             }
             [2]=>
             &string(3) "and"
             [3]=>
             &string(4) "name"
           }
         }
         [2]=>
         array(4) {
           ["file"]=>
           string(44) "/webstuff/canalblogs/wp-includes/rewrite.php"
           ["line"]=>
           int(1367)
           ["function"]=>
           string(14) "get_post_types"
           ["args"]=>
           array(1) {
             [0]=>
             &array(1) {
               ["_builtin"]=>
               bool(false)
             }
           }
         }
         [3]=>
         array(7) {
           ["file"]=>
           string(44) "/webstuff/canalblogs/wp-includes/rewrite.php"
           ["line"]=>
           int(1517)
           ["function"]=>
           string(22) "generate_rewrite_rules"
           ["class"]=>
           string(10) "WP_Rewrite"
           ["object"]=>
           object(WP_Rewrite)#263 (24) {
             ["permalink_structure"]=>
             string(41) "/blog/%year%/%monthnum%/%day%/%postname%/"
             ["use_trailing_slashes"]=>
             bool(true)
             ["author_base"]=>
             string(6) "author"
             ["search_base"]=>
             string(6) "search"
             ["comments_base"]=>
             string(8) "comments"
             ["pagination_base"]=>
             string(4) "page"
             ["feed_base"]=>
             string(4) "feed"
             ["comments_feed_structure"]=>
             NULL
             ["front"]=>
             string(6) "/blog/"
             ["root"]=>
             string(0) ""
             ["index"]=>
             string(9) "index.php"
             ["matches"]=>
             string(7) "matches"
             ["rules"]=>
             bool(false)
             ["extra_rules"]=>
             array(0) {
             }
             ["extra_rules_top"]=>
             array(0) {
             }
             ["non_wp_rules"]=>
             array(0) {
             }
             ["extra_permastructs"]=>
             array(0) {
             }
             ["endpoints"]=>
             array(0) {
             }
             ["use_verbose_rules"]=>
             bool(false)
             ["use_verbose_page_rules"]=>
             bool(false)
             ["rewritecode"]=>
             array(11) {
               [0]=>
               string(6) "%year%"
               [1]=>
               string(10) "%monthnum%"
               [2]=>
               string(5) "%day%"
               [3]=>
               string(6) "%hour%"
               [4]=>
               string(8) "%minute%"
               [5]=>
               string(8) "%second%"
               [6]=>
               string(10) "%postname%"
               [7]=>
               string(9) "%post_id%"
               [8]=>
               string(8) "%author%"
               [9]=>
               string(10) "%pagename%"
               [10]=>
               string(8) "%search%"
             }
             ["rewritereplace"]=>
             array(11) {
               [0]=>
               string(10) "([0-9]{4})"
               [1]=>
               string(12) "([0-9]{1,2})"
               [2]=>
               string(12) "([0-9]{1,2})"
               [3]=>
               string(12) "([0-9]{1,2})"
               [4]=>
               string(12) "([0-9]{1,2})"
               [5]=>
               string(12) "([0-9]{1,2})"
               [6]=>
               string(7) "([^/]+)"
               [7]=>
               string(8) "([0-9]+)"
               [8]=>
               string(7) "([^/]+)"
               [9]=>
               string(8) "([^/]+?)"
               [10]=>
               string(4) "(.+)"
             }
             ["queryreplace"]=>
             array(11) {
               [0]=>
               string(5) "year="
               [1]=>
               string(9) "monthnum="
               [2]=>
               string(4) "day="
               [3]=>
               string(5) "hour="
               [4]=>
               string(7) "minute="
               [5]=>
               string(7) "second="
               [6]=>
               string(5) "name="
               [7]=>
               string(2) "p="
               [8]=>
               string(12) "author_name="
               [9]=>
               string(9) "pagename="
               [10]=>
               string(2) "s="
             }
             ["feeds"]=>
             array(5) {
               [0]=>
               string(4) "feed"
               [1]=>
               string(3) "rdf"
               [2]=>
               string(3) "rss"
               [3]=>
               string(4) "rss2"
               [4]=>
               string(4) "atom"
             }
           }
           ["type"]=>
           string(2) "->"
           ["args"]=>
           array(2) {
             [0]=>
             &string(41) "/blog/%year%/%monthnum%/%day%/%postname%/"
             [1]=>
             ∫(1)
           }
         }
         [4]=>
         array(7) {
           ["file"]=>
           string(44) "/webstuff/canalblogs/wp-includes/rewrite.php"
           ["line"]=>
           int(1589)
           ["function"]=>
           string(13) "rewrite_rules"
           ["class"]=>
           string(10) "WP_Rewrite"
           ["object"]=>
           object(WP_Rewrite)#263 (24) {
             ["permalink_structure"]=>
             string(41) "/blog/%year%/%monthnum%/%day%/%postname%/"
             ["use_trailing_slashes"]=>
             bool(true)
             ["author_base"]=>
             string(6) "author"
             ["search_base"]=>
             string(6) "search"
             ["comments_base"]=>
             string(8) "comments"
             ["pagination_base"]=>
             string(4) "page"
             ["feed_base"]=>
             string(4) "feed"
             ["comments_feed_structure"]=>
             NULL
             ["front"]=>
             string(6) "/blog/"
             ["root"]=>
             string(0) ""
             ["index"]=>
             string(9) "index.php"
             ["matches"]=>
             string(7) "matches"
             ["rules"]=>
             bool(false)
             ["extra_rules"]=>
             array(0) {
             }
             ["extra_rules_top"]=>
             array(0) {
             }
             ["non_wp_rules"]=>
             array(0) {
             }
             ["extra_permastructs"]=>
             array(0) {
             }
             ["endpoints"]=>
             array(0) {
             }
             ["use_verbose_rules"]=>
             bool(false)
             ["use_verbose_page_rules"]=>
             bool(false)
             ["rewritecode"]=>
             array(11) {
               [0]=>
               string(6) "%year%"
               [1]=>
               string(10) "%monthnum%"
               [2]=>
               string(5) "%day%"
               [3]=>
               string(6) "%hour%"
               [4]=>
               string(8) "%minute%"
               [5]=>
               string(8) "%second%"
               [6]=>
               string(10) "%postname%"
               [7]=>
               string(9) "%post_id%"
               [8]=>
               string(8) "%author%"
               [9]=>
               string(10) "%pagename%"
               [10]=>
               string(8) "%search%"
             }
             ["rewritereplace"]=>
             array(11) {
               [0]=>
               string(10) "([0-9]{4})"
               [1]=>
               string(12) "([0-9]{1,2})"
               [2]=>
               string(12) "([0-9]{1,2})"
               [3]=>
               string(12) "([0-9]{1,2})"
               [4]=>
               string(12) "([0-9]{1,2})"
               [5]=>
               string(12) "([0-9]{1,2})"
               [6]=>
               string(7) "([^/]+)"
               [7]=>
               string(8) "([0-9]+)"
               [8]=>
               string(7) "([^/]+)"
               [9]=>
               string(8) "([^/]+?)"
               [10]=>
               string(4) "(.+)"
             }
             ["queryreplace"]=>
             array(11) {
               [0]=>
               string(5) "year="
               [1]=>
               string(9) "monthnum="
               [2]=>
               string(4) "day="
               [3]=>
               string(5) "hour="
               [4]=>
               string(7) "minute="
               [5]=>
               string(7) "second="
               [6]=>
               string(5) "name="
               [7]=>
               string(2) "p="
               [8]=>
               string(12) "author_name="
               [9]=>
               string(9) "pagename="
               [10]=>
               string(2) "s="
             }
             ["feeds"]=>
             array(5) {
               [0]=>
               string(4) "feed"
               [1]=>
               string(3) "rdf"
               [2]=>
               string(3) "rss"
               [3]=>
               string(4) "rss2"
               [4]=>
               string(4) "atom"
             }
           }
           ["type"]=>
           string(2) "->"
           ["args"]=>
           array(0) {
           }
         }
         [5]=>
         array(7) {
           ["file"]=>
           string(44) "/webstuff/canalblogs/wp-includes/rewrite.php"
           ["line"]=>
           int(1876)
           ["function"]=>
           string(16) "wp_rewrite_rules"
           ["class"]=>
           string(10) "WP_Rewrite"
           ["object"]=>
           object(WP_Rewrite)#263 (24) {
             ["permalink_structure"]=>
             string(41) "/blog/%year%/%monthnum%/%day%/%postname%/"
             ["use_trailing_slashes"]=>
             bool(true)
             ["author_base"]=>
             string(6) "author"
             ["search_base"]=>
             string(6) "search"
             ["comments_base"]=>
             string(8) "comments"
             ["pagination_base"]=>
             string(4) "page"
             ["feed_base"]=>
             string(4) "feed"
             ["comments_feed_structure"]=>
             NULL
             ["front"]=>
             string(6) "/blog/"
             ["root"]=>
             string(0) ""
             ["index"]=>
             string(9) "index.php"
             ["matches"]=>
             string(7) "matches"
             ["rules"]=>
             bool(false)
             ["extra_rules"]=>
             array(0) {
             }
             ["extra_rules_top"]=>
             array(0) {
             }
             ["non_wp_rules"]=>
             array(0) {
             }
             ["extra_permastructs"]=>
             array(0) {
             }
             ["endpoints"]=>
             array(0) {
             }
             ["use_verbose_rules"]=>
             bool(false)
             ["use_verbose_page_rules"]=>
             bool(false)
             ["rewritecode"]=>
             array(11) {
               [0]=>
               string(6) "%year%"
               [1]=>
               string(10) "%monthnum%"
               [2]=>
               string(5) "%day%"
               [3]=>
               string(6) "%hour%"
               [4]=>
               string(8) "%minute%"
               [5]=>
               string(8) "%second%"
               [6]=>
               string(10) "%postname%"
               [7]=>
               string(9) "%post_id%"
               [8]=>
               string(8) "%author%"
               [9]=>
               string(10) "%pagename%"
               [10]=>
               string(8) "%search%"
             }
             ["rewritereplace"]=>
             array(11) {
               [0]=>
               string(10) "([0-9]{4})"
               [1]=>
               string(12) "([0-9]{1,2})"
               [2]=>
               string(12) "([0-9]{1,2})"
               [3]=>
               string(12) "([0-9]{1,2})"
               [4]=>
               string(12) "([0-9]{1,2})"
               [5]=>
               string(12) "([0-9]{1,2})"
               [6]=>
               string(7) "([^/]+)"
               [7]=>
               string(8) "([0-9]+)"
               [8]=>
               string(7) "([^/]+)"
               [9]=>
               string(8) "([^/]+?)"
               [10]=>
               string(4) "(.+)"
             }
             ["queryreplace"]=>
             array(11) {
               [0]=>
               string(5) "year="
               [1]=>
               string(9) "monthnum="
               [2]=>
               string(4) "day="
               [3]=>
               string(5) "hour="
               [4]=>
               string(7) "minute="
               [5]=>
               string(7) "second="
               [6]=>
               string(5) "name="
               [7]=>
               string(2) "p="
               [8]=>
               string(12) "author_name="
               [9]=>
               string(9) "pagename="
               [10]=>
               string(2) "s="
             }
             ["feeds"]=>
             array(5) {
               [0]=>
               string(4) "feed"
               [1]=>
               string(3) "rdf"
               [2]=>
               string(3) "rss"
               [3]=>
               string(4) "rss2"
               [4]=>
               string(4) "atom"
             }
           }
           ["type"]=>
           string(2) "->"
           ["args"]=>
           array(0) {
           }
         }
         [6]=>
         array(7) {
           ["file"]=>
           string(65) "/webstuff/canalblogs/wp-content/mu-plugins/global-site-search.php"
           ["line"]=>
           int(40)
           ["function"]=>
           string(11) "flush_rules"
           ["class"]=>
           string(10) "WP_Rewrite"
           ["object"]=>
           object(WP_Rewrite)#263 (24) {
             ["permalink_structure"]=>
             string(41) "/blog/%year%/%monthnum%/%day%/%postname%/"
             ["use_trailing_slashes"]=>
             bool(true)
             ["author_base"]=>
             string(6) "author"
             ["search_base"]=>
             string(6) "search"
             ["comments_base"]=>
             string(8) "comments"
             ["pagination_base"]=>
             string(4) "page"
             ["feed_base"]=>
             string(4) "feed"
             ["comments_feed_structure"]=>
             NULL
             ["front"]=>
             string(6) "/blog/"
             ["root"]=>
             string(0) ""
             ["index"]=>
             string(9) "index.php"
             ["matches"]=>
             string(7) "matches"
             ["rules"]=>
             bool(false)
             ["extra_rules"]=>
             array(0) {
             }
             ["extra_rules_top"]=>
             array(0) {
             }
             ["non_wp_rules"]=>
             array(0) {
             }
             ["extra_permastructs"]=>
             array(0) {
             }
             ["endpoints"]=>
             array(0) {
             }
             ["use_verbose_rules"]=>
             bool(false)
             ["use_verbose_page_rules"]=>
             bool(false)
             ["rewritecode"]=>
             array(11) {
               [0]=>
               string(6) "%year%"
               [1]=>
               string(10) "%monthnum%"
               [2]=>
               string(5) "%day%"
               [3]=>
               string(6) "%hour%"
               [4]=>
               string(8) "%minute%"
               [5]=>
               string(8) "%second%"
               [6]=>
               string(10) "%postname%"
               [7]=>
               string(9) "%post_id%"
               [8]=>
               string(8) "%author%"
               [9]=>
               string(10) "%pagename%"
               [10]=>
               string(8) "%search%"
             }
             ["rewritereplace"]=>
             array(11) {
               [0]=>
               string(10) "([0-9]{4})"
               [1]=>
               string(12) "([0-9]{1,2})"
               [2]=>
               string(12) "([0-9]{1,2})"
               [3]=>
               string(12) "([0-9]{1,2})"
               [4]=>
               string(12) "([0-9]{1,2})"
               [5]=>
               string(12) "([0-9]{1,2})"
               [6]=>
               string(7) "([^/]+)"
               [7]=>
               string(8) "([0-9]+)"
               [8]=>
               string(7) "([^/]+)"
               [9]=>
               string(8) "([^/]+?)"
               [10]=>
               string(4) "(.+)"
             }
             ["queryreplace"]=>
             array(11) {
               [0]=>
               string(5) "year="
               [1]=>
               string(9) "monthnum="
               [2]=>
               string(4) "day="
               [3]=>
               string(5) "hour="
               [4]=>
               string(7) "minute="
               [5]=>
               string(7) "second="
               [6]=>
               string(5) "name="
               [7]=>
               string(2) "p="
               [8]=>
               string(12) "author_name="
               [9]=>
               string(9) "pagename="
               [10]=>
               string(2) "s="
             }
             ["feeds"]=>
             array(5) {
               [0]=>
               string(4) "feed"
               [1]=>
               string(3) "rdf"
               [2]=>
               string(3) "rss"
               [3]=>
               string(4) "rss2"
               [4]=>
               string(4) "atom"
             }
           }
           ["type"]=>
           string(2) "->"
           ["args"]=>
           array(0) {
           }
         }
         [7]=>
         array(4) {
           ["file"]=>
           string(36) "/webstuff/canalblogs/wp-settings.php"
           ["line"]=>
           int(154)
           ["args"]=>
           array(1) {
             [0]=>
             string(65) "/webstuff/canalblogs/wp-content/mu-plugins/global-site-search.php"
           }
           ["function"]=>
           string(12) "include_once"
         }
         [8]=>
         array(4) {
           ["file"]=>
           string(34) "/webstuff/canalblogs/wp-config.php"
           ["line"]=>
           int(61)
           ["args"]=>
           array(1) {
             [0]=>
             string(36) "/webstuff/canalblogs/wp-settings.php"
           }
           ["function"]=>
           string(12) "require_once"
         }
         [9]=>
         array(4) {
           ["file"]=>
           string(32) "/webstuff/canalblogs/wp-load.php"
           ["line"]=>
           int(30)
           ["args"]=>
           array(1) {
             [0]=>
             string(34) "/webstuff/canalblogs/wp-config.php"
           }
           ["function"]=>
           string(12) "require_once"
         }
         [10]=>
         array(4) {
           ["file"]=>
           string(39) "/webstuff/canalblogs/wp-blog-header.php"
           ["line"]=>
           int(12)
           ["args"]=>
           array(1) {
             [0]=>
             string(32) "/webstuff/canalblogs/wp-load.php"
           }
           ["function"]=>
           string(12) "require_once"
         }
         [11]=>
         array(4) {
           ["file"]=>
           string(30) "/webstuff/canalblogs/index.php"
           ["line"]=>
           int(17)
           ["args"]=>
           array(1) {
             [0]=>
             string(39) "/webstuff/canalblogs/wp-blog-header.php"
           }
           ["function"]=>
           string(7) "require"
         }
       }
       ```
   
 * and now I’ll go in and start turning stuff off
 *  Thread Starter [Steve](https://wordpress.org/support/users/steveatty/)
 * (@steveatty)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841413)
 * It would seem to be a couple of Network Blog plugins – specifically the global-
   site-search plugin from WPMUDEV causing the problem so I’ll chase it up with 
   the developers.
 * But the odd thing is that nothing seems to be broken – so is it actually acceptable
   that that variable is null?
 *  [Ivan Shaovchev](https://wordpress.org/support/users/ivanshaovchev/)
 * (@ivanshaovchev)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841511)
 * Not sure why, but I think something like that is causing the warnings: `$param
   = new WP_Rewrite;`
 *  [Andrew Nacin](https://wordpress.org/support/users/nacin/)
 * (@nacin)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841513)
 * Indeed, global-site-search.php is calling WP_Rewrite a bit early, it seems. That’s
   a bad way of doing things; they should instead wait until init to touch the rewrite
   engine.
 * Unfortunately, that code is behind a pay wall, so I can’t help the WPMUDEV guys
   further unless they wish to reach out. (If you contact them, you can let them
   know I’m willing to assist.)
 *  [Ivan Shaovchev](https://wordpress.org/support/users/ivanshaovchev/)
 * (@ivanshaovchev)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841515)
 * Thanks Andrew, hooking it to ‘init’ solves the problem, I will let them know 
   😉
 *  Thread Starter [Steve](https://wordpress.org/support/users/steveatty/)
 * (@steveatty)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841519)
 * Ivan – so the new_WP_Rewrites and the flush_rules just need wrapping into an 
   init function?
 *  [Ivan Shaovchev](https://wordpress.org/support/users/ivanshaovchev/)
 * (@ivanshaovchev)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841520)
 * Correct.
 *  [Aphrodite](https://wordpress.org/support/users/aphrodite/)
 * (@aphrodite)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841583)
 * Ivan, blog directory is one of the sources 😉

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The topic ‘3.1 RC2 – Invalid argument supplied for foreach()’ is closed to new replies.

 * In: [Alpha/Beta/RC](https://wordpress.org/support/forum/alphabeta/)
 * 9 replies
 * 4 participants
 * Last reply from: [Aphrodite](https://wordpress.org/support/users/aphrodite/)
 * Last activity: [15 years, 3 months ago](https://wordpress.org/support/topic/invalid-argument-supplied-for-foreach-4-2/#post-1841583)
 * Status: not resolved

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