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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 |
|---|---|
| 253 | * |
| 254 | * Allows (publicly allowed) query vars to be added, removed, or changed prior |
| 255 | * to executing the query. Needed to allow custom rewrite rules using your own arguments |
| 256 | * to work, or any other custom query variables you want to be publicly available. |
| 257 | * |
| 258 | * @since 1.5.0 |
| 259 | * |
| 260 | * @param array $public_query_vars The array of whitelisted query variables. |
| 261 | */ |
| 262 | $this->public_query_vars = apply_filters( 'query_vars', $this->public_query_vars ); |
| 263 | |
| 264 | foreach ( get_post_types( array(), 'objects' ) as $post_type => $t ) |
| 265 | if ( $t->query_var ) |
| 266 | $post_type_query_vars[$t->query_var] = $post_type; |
| 267 | |
| 268 | foreach ( $this->public_query_vars as $wpvar ) { |
| 269 | if ( isset( $this->extra_query_vars[$wpvar] ) ) |
| 270 | $this->query_vars[$wpvar] = $this->extra_query_vars[$wpvar]; |
| 271 | elseif ( isset( $_POST[$wpvar] ) ) |