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