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Count action hooks and filters

Select the Count action hooks and filters check box when you want to discover all the action hooks and filters that are invoked.

When tracing is active then at shutdown a number of trace records are written summarising the action hooks and filters that have been invoked.

Information traced

wp_actions shows the contents of global $wp_actions formatted as hook shortcodes
bw_action_counts shows the oik-bwtrace global $bw_action_counts formatted as shortcodes
most used bw_action_counts array sorted by invocation count descending
by hook name bw_action_counts array sorted by hook name ascending
unique hooks Count of the number of unique hooks invoked
total hooks Count of the total number of action/filter hooks invoked
bw_action_counts_tree view of the counts taking into account nested actions and filters

Hook shortcode parameters

The hook shortcode takes 5 positional parameters:

  1. Hook name(s)
  2. Hook type: action or filter
  3. Number of args passed
  4. Number of invocations
  5. Attached hook function count

To find which functions are attached use Trace attached hooks functions.

Example wp_actions

C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\oik-action-counts.php(205:0)
bw_trace_create_hook_links(1) 39 2 2019-12-04T17:50:01+00:00 0.311519 0.011168 
cf=shutdown 12898 52 3912 6291456/6291456 256M F=601 hook_links 
<h3>wp_actions</h3>

mu_plugin_loaded - action13


muplugins_loaded - action01


registered_taxonomy - action326


registered_post_type - action241


plugin_loaded - action137


load_textdomain - action220


plugins_loaded - action01

...

shutdown - action01

The wp_actions array may include some actions invoked before action counting was initiated.
See Must-Use and Drop-In logic.

Example bw_action_counts

C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\oik-action-counts.php(205:0)
bw_trace_create_hook_links(2) 40 2 2019-12-04T17:50:01+00:00 0.314809 0.003290 
cf=shutdown 12898 52 3912 6291456/6291456 256M F=601 hook_links 
<h3>bw_action_counts</h3>

pre_determine_locale - filter119


pre_option_WPLANG - filter31


alloptions - filter1790


option_WPLANG - filter21


locale - filter141


determine_locale - filter119


gettext - filter34834

...

shutdown - action01

Example most used

The most used list only shows the hooks that are implemented. In this example we don’t see gettext. The filter is applied many times but there aren’t any attached filter functions.

C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\oik-action-counts.php(205:0)
bw_trace_create_hook_links(3) 41 2 2019-12-04T17:50:01+00:00 0.315855 0.001046 
cf=shutdown 12898 52 3912 6291456/6291456 256M F=601 hook_links 
<h3>most used</h3>

option_siteurl - filter2111


option_home - filter275


map_meta_cap - filter462


user_has_cap - filter462


query - filter151


get_user_metadata - filter448


pre_render_block - filter247

...

shutdown - action01

Example by hook name

C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\oik-action-counts.php(205:0) 
bw_trace_create_hook_links(4) 42 2 2019-12-04T17:50:01+00:00 0.316775 0.000920 
cf=shutdown 12898 52 3912 6291456/6291456 256M F=601 hook_links 
<h3>by hook name</h3>

_get_page_link - filter210


add_admin_bar_menus - action01


add_extra_wpseo_meta_fields - filter11


admin_bar_init - action01


admin_bar_menu - action11


admin_url - filter366


after_setup_theme - action01


alloptions - filter1790

...

yoast_seo_development_mode - filter11

Example count hooks

C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\oik-action-counts.php(162:0)
bw_trace_count_report(1) 43 2 2019-12-04T17:50:01+00:00 0.317042 0.000267 
cf=shutdown 12898 52 3912 6291456/6291456 256M F=601 
count hooks 753

Example total hooks

C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\oik-action-counts.php(163:0) 
bw_trace_count_report(2) 44 2 2019-12-04T17:50:01+00:00 0.317178 0.000136 cf=shutdown 12898 52 3912 6291456/6291456 256M F=601 
total hooks 12895

Example bw_action_counts_tree

C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\oik-action-counts.php(205:0) 
bw_trace_create_hook_links(5) 45 2 2019-12-04T17:50:01+00:00 0.318589 0.001411 
cf=shutdown 12898 52 3912 6291456/6291456 256M F=601 hook_links 
<h3>bw_action_counts_tree</h3>

pre_determine_locale - filter15


pre_option_WPLANG - filter31


alloptions - filter1248

...

plugins_loaded - action01


  load_default_widgets - filter11

...

  wp_after_admin_bar_render - action01


shutdown - action01

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