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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 |
|---|---|
| 238 | |
| 239 | $groupby = ''; |
| 240 | |
| 241 | $this->query_vars = wp_parse_args( $query_vars, $defaults ); |
| 242 | |
| 243 | // Parse meta query |
| 244 | $this->meta_query = new WP_Meta_Query(); |
| 245 | $this->meta_query->parse_query_vars( $this->query_vars ); |
| 246 | |
| 247 | do_action_ref_array( 'pre_get_comments', array( &$this ) ); |
| 248 | extract( $this->query_vars, EXTR_SKIP ); |
| 249 | |
| 250 | // $args can be whatever, only use the args defined in defaults to compute the key |
| 251 | $key = md5( serialize( compact(array_keys($defaults)) ) ); |
| 252 | $last_changed = wp_cache_get( 'last_changed', 'comment' ); |
| 253 | if ( ! $last_changed ) { |
| 254 | $last_changed = microtime(); |
| 255 | wp_cache_set( 'last_changed', $last_changed, 'comment' ); |
| 256 | } |