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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 | 
|---|---|
| 100 |            */ | 
| 101 |           $dashboard_widgets = apply_filters( 'wp_user_dashboard_widgets', array() ); | 
| 102 |      } else { | 
| 103 |  | 
| 104 |           /** | 
| 105 |            * Fires after core widgets for the admin dashboard have been registered. | 
| 106 |            * | 
| 107 |            * @since 2.5.0 | 
| 108 |            */ | 
| 109 |           do_action( 'wp_dashboard_setup' ); | 
| 110 |  | 
| 111 |           /** | 
| 112 |            * Filters the list of widgets to load for the admin dashboard. | 
| 113 |            * | 
| 114 |            * @since 2.5.0 | 
| 115 |            * | 
| 116 |            * @param string[] $dashboard_widgets An array of dashboard widget IDs. | 
| 117 |            */ | 
| 118 |           $dashboard_widgets = apply_filters( 'wp_dashboard_widgets', array() ); |