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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 |
|---|---|
| 268 | $this->meta_query->parse_query_vars( $this->query_vars ); |
| 269 | |
| 270 | /** |
| 271 | * Fires before comments are retrieved. |
| 272 | * |
| 273 | * @since 3.1.0 |
| 274 | * |
| 275 | * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference. |
| 276 | */ |
| 277 | do_action_ref_array( 'pre_get_comments', array( &$this ) ); |
| 278 | extract( $this->query_vars, EXTR_SKIP ); |
| 279 | |
| 280 | // $args can be whatever, only use the args defined in defaults to compute the key |
| 281 | $key = md5( serialize( compact(array_keys($defaults)) ) ); |
| 282 | $last_changed = wp_cache_get( 'last_changed', 'comment' ); |
| 283 | if ( ! $last_changed ) { |
| 284 | $last_changed = microtime(); |
| 285 | wp_cache_set( 'last_changed', $last_changed, 'comment' ); |
| 286 | } |