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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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355 | $this->meta_query->parse_query_vars( $args ); |
356 |
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357 | /** |
358 | * Fires before terms are retrieved. |
359 | * |
360 | * @since 4.6.0 |
361 | * |
362 | * @param WP_Term_Query $query Current instance of WP_Term_Query (passed by reference). |
363 | */ |
364 | do_action_ref_array( 'pre_get_terms', array( &$this ) ); |
365 |
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366 | $taxonomies = (array) $args['taxonomy']; |
367 |
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368 | // Save queries by not crawling the tree in the case of multiple taxes or a flat tax. |
369 | $has_hierarchical_tax = false; |
370 | if ( $taxonomies ) { |
371 | foreach ( $taxonomies as $_tax ) { |
372 | if ( is_taxonomy_hierarchical( $_tax ) ) { |
373 | $has_hierarchical_tax = true; |