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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.
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319 | $this->query_vars = wp_parse_args( $query, $this->query_var_defaults ); |
320 |
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321 | /** |
322 | * Fires after the comment query vars have been parsed. |
323 | * |
324 | * @since 4.2.0 |
325 | * |
326 | * @param WP_Comment_Query $this The WP_Comment_Query instance (passed by reference). |
327 | */ |
328 | do_action_ref_array( 'parse_comment_query', array( &$this ) ); |
329 | } |
330 |
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331 | /** |
332 | * Sets up the WordPress query for retrieving comments. |
333 | * |
334 | * @since 3.1.0 |
335 | * @since 4.1.0 Introduced 'comment__in', 'comment__not_in', 'post_author__in', |
336 | * 'post_author__not_in', 'author__in', 'author__not_in', 'post__in', |
337 | * 'post__not_in', 'include_unapproved', 'type__in', and 'type__not_in' |