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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 |
|---|---|
| 409 | $this->meta_query->parse_query_vars( $this->query_vars ); |
| 410 | |
| 411 | /** |
| 412 | * Fires before comments are retrieved. |
| 413 | * |
| 414 | * @since 3.1.0 |
| 415 | * |
| 416 | * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference. |
| 417 | */ |
| 418 | do_action_ref_array( 'pre_get_comments', array( &$this ) ); |
| 419 | |
| 420 | // $args can be whatever, only use the args defined in defaults to compute the key |
| 421 | $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $defaults ) ) ) ); |
| 422 | $last_changed = wp_cache_get( 'last_changed', 'comment' ); |
| 423 | if ( ! $last_changed ) { |
| 424 | $last_changed = microtime(); |
| 425 | wp_cache_set( 'last_changed', $last_changed, 'comment' ); |
| 426 | } |
| 427 | $cache_key = "get_comments:$key:$last_changed"; |