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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 |
|---|---|
| 278 | * |
| 279 | * Allows (publicly allowed) query vars to be added, removed, or changed prior |
| 280 | * to executing the query. Needed to allow custom rewrite rules using your own arguments |
| 281 | * to work, or any other custom query variables you want to be publicly available. |
| 282 | * |
| 283 | * @since 1.5.0 |
| 284 | * |
| 285 | * @param string[] $public_query_vars The array of whitelisted query variable names. |
| 286 | */ |
| 287 | $this->public_query_vars = apply_filters( 'query_vars', $this->public_query_vars ); |
| 288 | |
| 289 | foreach ( get_post_types( array(), 'objects' ) as $post_type => $t ) { |
| 290 | if ( is_post_type_viewable( $t ) && $t->query_var ) { |
| 291 | $post_type_query_vars[ $t->query_var ] = $post_type; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | foreach ( $this->public_query_vars as $wpvar ) { |
| 296 | if ( isset( $this->extra_query_vars[ $wpvar ] ) ) { |