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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 |
|---|---|
| 249 | * returning that value otherwise. |
| 250 | * |
| 251 | * @since 3.9.0 |
| 252 | * |
| 253 | * @see wp_nav_menu() |
| 254 | * |
| 255 | * @param string|null $output Nav menu output to short-circuit with. Default null. |
| 256 | * @param object $args An object containing wp_nav_menu() arguments. |
| 257 | */ |
| 258 | $nav_menu = apply_filters( 'pre_wp_nav_menu', null, $args ); |
| 259 | |
| 260 | if ( null !== $nav_menu ) { |
| 261 | if ( $args->echo ) { |
| 262 | echo $nav_menu; |
| 263 | return; |
| 264 | } |
| 265 | |
| 266 | return $nav_menu; |
| 267 | } |