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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 |
|---|---|
| 315 | $this->meta_query->parse_query_vars( $args ); |
| 316 | |
| 317 | /** |
| 318 | * Fires before terms are retrieved. |
| 319 | * |
| 320 | * @since 4.6.0 |
| 321 | * |
| 322 | * @param WP_Term_Query $this Current instance of WP_Term_Query. |
| 323 | */ |
| 324 | do_action( 'pre_get_terms', $this ); |
| 325 | |
| 326 | $taxonomies = (array) $args['taxonomy']; |
| 327 | |
| 328 | // Save queries by not crawling the tree in the case of multiple taxes or a flat tax. |
| 329 | $has_hierarchical_tax = false; |
| 330 | if ( $taxonomies ) { |
| 331 | foreach ( $taxonomies as $_tax ) { |
| 332 | if ( is_taxonomy_hierarchical( $_tax ) ) { |
| 333 | $has_hierarchical_tax = true; |