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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 4 times in this file.
| Line | Code |
|---|---|
| 168 | * @global array $wp_filter Stores all of the filters. |
| 169 | * @global array $merged_filters Merges the filter hooks using this function. |
| 170 | * @global array $wp_current_filter Stores the list of current filters with the current one last. |
| 171 | * |
| 172 | * @param string $tag The name of the filter hook. |
| 173 | * @param mixed $value The value on which the filters hooked to `$tag` are applied on. |
| 174 | * @param mixed $var Additional variables passed to the functions hooked to `$tag`. |
| 175 | * @return mixed The filtered value after all hooked functions are applied to it. |
| 176 | */ |
| 177 | function apply_filters( $tag, $value ) { |
| 178 | global $wp_filter, $merged_filters, $wp_current_filter; |
| 179 | |
| 180 | $args = array(); |
| 181 | |
| 182 | // Do 'all' actions first. |
| 183 | if ( isset($wp_filter['all']) ) { |
| 184 | $wp_current_filter[] = $tag; |
| 185 | $args = func_get_args(); |
| 186 | _wp_call_all_hook($args); |
| Line | Code |
| 230 | * |
| 231 | * @global array $wp_filter Stores all of the filters |
| 232 | * @global array $merged_filters Merges the filter hooks using this function. |
| 233 | * @global array $wp_current_filter Stores the list of current filters with the current one last |
| 234 | * |
| 235 | * @param string $tag The name of the filter hook. |
| 236 | * @param array $args The arguments supplied to the functions hooked to $tag. |
| 237 | * @return mixed The filtered value after all hooked functions are applied to it. |
| 238 | */ |
| 239 | function apply_filters_ref_array($tag, $args) { |
| 240 | global $wp_filter, $merged_filters, $wp_current_filter; |
| 241 | |
| 242 | // Do 'all' actions first |
| 243 | if ( isset($wp_filter['all']) ) { |
| 244 | $wp_current_filter[] = $tag; |
| 245 | $all_args = func_get_args(); |
| 246 | _wp_call_all_hook($all_args); |
| 247 | } |
| 248 | |
| Line | Code |
| 451 | * @global array $wp_filter Stores all of the filters |
| 452 | * @global array $wp_actions Increments the amount of times action was triggered. |
| 453 | * @global array $merged_filters Merges the filter hooks using this function. |
| 454 | * @global array $wp_current_filter Stores the list of current filters with the current one last |
| 455 | * |
| 456 | * @param string $tag The name of the action to be executed. |
| 457 | * @param mixed $arg Optional. Additional arguments which are passed on to the |
| 458 | * functions hooked to the action. Default empty. |
| 459 | */ |
| 460 | function do_action($tag, $arg = '') { |
| 461 | global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter; |
| 462 | |
| 463 | if ( ! isset($wp_actions[$tag]) ) |
| 464 | $wp_actions[$tag] = 1; |
| 465 | else |
| 466 | ++$wp_actions[$tag]; |
| 467 | |
| 468 | // Do 'all' actions first |
| 469 | if ( isset($wp_filter['all']) ) { |
| Line | Code |
| 535 | * functions hooked to $tag< are supplied using an array. |
| 536 | * @global array $wp_filter Stores all of the filters |
| 537 | * @global array $wp_actions Increments the amount of times action was triggered. |
| 538 | * @global array $merged_filters Merges the filter hooks using this function. |
| 539 | * @global array $wp_current_filter Stores the list of current filters with the current one last |
| 540 | * |
| 541 | * @param string $tag The name of the action to be executed. |
| 542 | * @param array $args The arguments supplied to the functions hooked to `$tag`. |
| 543 | */ |
| 544 | function do_action_ref_array($tag, $args) { |
| 545 | global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter; |
| 546 | |
| 547 | if ( ! isset($wp_actions[$tag]) ) |
| 548 | $wp_actions[$tag] = 1; |
| 549 | else |
| 550 | ++$wp_actions[$tag]; |
| 551 | |
| 552 | // Do 'all' actions first |
| 553 | if ( isset($wp_filter['all']) ) { |