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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.
| Line | Code |
|---|---|
| 220 | 'post_type' => '', |
| 221 | 'status' => '', |
| 222 | 'type' => '', |
| 223 | 'user_id' => '', |
| 224 | 'search' => '', |
| 225 | 'count' => false |
| 226 | ); |
| 227 | |
| 228 | $this->query_vars = wp_parse_args( $query_vars, $defaults ); |
| 229 | do_action_ref_array( 'pre_get_comments', array( &$this ) ); |
| 230 | extract( $this->query_vars, EXTR_SKIP ); |
| 231 | |
| 232 | // $args can be whatever, only use the args defined in defaults to compute the key |
| 233 | $key = md5( serialize( compact(array_keys($defaults)) ) ); |
| 234 | $last_changed = wp_cache_get('last_changed', 'comment'); |
| 235 | if ( !$last_changed ) { |
| 236 | $last_changed = time(); |
| 237 | wp_cache_set('last_changed', $last_changed, 'comment'); |
| 238 | } |