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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 |
|---|---|
| 277 | * returning that value otherwise. |
| 278 | * |
| 279 | * @since 3.9.0 |
| 280 | * |
| 281 | * @see wp_nav_menu() |
| 282 | * |
| 283 | * @param string|null $output Nav menu output to short-circuit with. Default null. |
| 284 | * @param object $args An object containing wp_nav_menu() arguments. |
| 285 | */ |
| 286 | $nav_menu = apply_filters( 'pre_wp_nav_menu', null, $args ); |
| 287 | |
| 288 | if ( null !== $nav_menu ) { |
| 289 | if ( $args->echo ) { |
| 290 | echo $nav_menu; |
| 291 | return; |
| 292 | } |
| 293 | |
| 294 | return $nav_menu; |
| 295 | } |