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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 |
|---|---|
| 236 | * Filters the HTML content for navigation menus. |
| 237 | * |
| 238 | * @since 3.0.0 |
| 239 | * |
| 240 | * @see wp_nav_menu() |
| 241 | * |
| 242 | * @param string $nav_menu The HTML content for the navigation menu. |
| 243 | * @param object $args An object containing wp_nav_menu() arguments. |
| 244 | */ |
| 245 | $nav_menu = apply_filters( 'wp_nav_menu', $nav_menu, $args ); |
| 246 | |
| 247 | if ( $args->echo ) |
| 248 | echo $nav_menu; |
| 249 | else |
| 250 | return $nav_menu; |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Add the class property classes for the current context, if applicable. |