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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 |
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377 | $this->meta_query->parse_query_vars( $this->query_vars ); |
378 |
|
379 | /** |
380 | * Fires before comments are retrieved. |
381 | * |
382 | * @since 3.1.0 |
383 | * |
384 | * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference. |
385 | */ |
386 | do_action_ref_array( 'pre_get_comments', array( &$this ) ); |
387 |
|
388 | // Reparse query vars, in case they were modified in a 'pre_get_comments' callback. |
389 | $this->meta_query->parse_query_vars( $this->query_vars ); |
390 | if ( ! empty( $this->meta_query->queries ) ) { |
391 | $this->meta_query_clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this ); |
392 | } |
393 |
|
394 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
395 | $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) ); |