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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 |
|---|---|
| 359 | $this->meta_query->parse_query_vars( $args ); |
| 360 | |
| 361 | /** |
| 362 | * Fires before terms are retrieved. |
| 363 | * |
| 364 | * @since 4.6.0 |
| 365 | * |
| 366 | * @param WP_Term_Query $query Current instance of WP_Term_Query (passed by reference). |
| 367 | */ |
| 368 | do_action_ref_array( 'pre_get_terms', array( &$this ) ); |
| 369 | |
| 370 | $taxonomies = (array) $args['taxonomy']; |
| 371 | |
| 372 | // Save queries by not crawling the tree in the case of multiple taxes or a flat tax. |
| 373 | $has_hierarchical_tax = false; |
| 374 | if ( $taxonomies ) { |
| 375 | foreach ( $taxonomies as $_tax ) { |
| 376 | if ( is_taxonomy_hierarchical( $_tax ) ) { |
| 377 | $has_hierarchical_tax = true; |