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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 |
|---|---|
| 270 | * A truthy value must first be passed to the {@see 'custom_menu_order'} filter |
| 271 | * for this filter to work. Use the following to enable custom menu ordering: |
| 272 | * |
| 273 | * add_filter( 'custom_menu_order', '__return_true' ); |
| 274 | * |
| 275 | * @since 2.8.0 |
| 276 | * |
| 277 | * @param array $menu_order An ordered array of menu items. |
| 278 | */ |
| 279 | $menu_order = apply_filters( 'menu_order', $menu_order ); |
| 280 | $menu_order = array_flip( $menu_order ); |
| 281 | $default_menu_order = array_flip( $default_menu_order ); |
| 282 | |
| 283 | /** |
| 284 | * @global array $menu_order |
| 285 | * @global array $default_menu_order |
| 286 | * |
| 287 | * @param array $a |
| 288 | * @param array $b |