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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 |
|---|---|
| 483 | $this->meta_query->parse_query_vars( $this->query_vars ); |
| 484 | |
| 485 | /** |
| 486 | * Fires before comments are retrieved. |
| 487 | * |
| 488 | * @since 3.1.0 |
| 489 | * |
| 490 | * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference. |
| 491 | */ |
| 492 | do_action_ref_array( 'pre_get_comments', array( &$this ) ); |
| 493 | |
| 494 | // Reparse query vars, in case they were modified in a 'pre_get_comments' callback. |
| 495 | $this->meta_query->parse_query_vars( $this->query_vars ); |
| 496 | if ( ! empty( $this->meta_query->queries ) ) { |
| 497 | $meta_query_clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this ); |
| 498 | } |
| 499 | |
| 500 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
| 501 | $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) ); |