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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 |
|---|---|
| 175 | |
| 176 | /** |
| 177 | * Filters whether a nav menu is assigned to the specified location. |
| 178 | * |
| 179 | * @since 4.3.0 |
| 180 | * |
| 181 | * @param bool $has_nav_menu Whether there is a menu assigned to a location. |
| 182 | * @param string $location Menu location. |
| 183 | */ |
| 184 | return apply_filters( 'has_nav_menu', $has_nav_menu, $location ); |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Determines whether the given ID is a nav menu item. |
| 189 | * |
| 190 | * @since 3.0.0 |
| 191 | * |
| 192 | * @param int $menu_item_id The ID of the potential nav menu item. |
| 193 | * @return bool Whether the given ID is that of a nav menu item. |