[wp-trac] [WordPress Trac] #39132: WP 4.7 breaks if APC is not enabled in php

[WordPress Trac]

#39132: WP 4.7 breaks if APC is not enabled in php
----------------------------+-----------------------------
 Reporter:  innocuo         |      Owner:
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Bootstrap/Load  |    Version:  4.7
 Severity:  normal          |   Keywords:
  Focuses:                  |
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 '''This happens if PHP doesn't have APC enabled.'''

 In wp-includes/object-cache.php: the code checks if APC is enabled, by
 checking the existence of the function 'apc_fetch'. If it isn't, then it
 sets $GLOBALS`['_wp_using_ext_object_cache']` to false, and manually adds
 a filter to $wp_filter`['all']` , like this:

 {{{#!php
 $GLOBALS['wp_filter']['all'][-100]['apc_not_actually_running'] = array(
 'function' => 'apc_not_actually_running', 'accepted_args' => 0 );

 }}}


 Then, when _wp_call_all_hook() is called (this is in wp-
 includes/plugin.php), the code breaks.

 This happens because it does this:

 {{{#!php
 $wp_filter['all']->do_all_hook( $args );

 }}}

 meaning, it expects $wp_filter`['all']` to be a WP_Hook object, but it is
 an array due to the override that happened in object-cache.php (mentioned
 above).

 An "solution" for users would be to install and enable APC on php,
 or comment the line that adds the filter as an array in object-cache.php
 (line 667 in the latest version). The real solution would be to add this
 filter using/via WP_Hook?

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Ticket URL: <https://core.trac.wordpress.org/ticket/39132>
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