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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 |
|---|---|
| 277 | /** |
| 278 | * Filters the sidebar default arguments. |
| 279 | * |
| 280 | * @since 5.3.0 |
| 281 | * |
| 282 | * @see register_sidebar() |
| 283 | * |
| 284 | * @param array $defaults The default sidebar arguments. |
| 285 | */ |
| 286 | $sidebar = wp_parse_args( $args, apply_filters( 'register_sidebar_defaults', $defaults ) ); |
| 287 | |
| 288 | if ( $id_is_empty ) { |
| 289 | _doing_it_wrong( |
| 290 | __FUNCTION__, |
| 291 | sprintf( |
| 292 | /* translators: 1: The 'id' argument, 2: Sidebar name, 3: Recommended 'id' value. */ |
| 293 | __( 'No %1$s was set in the arguments array for the "%2$s" sidebar. Defaulting to "%3$s". Manually set the %1$s to "%3$s" to silence this notice and keep existing sidebar content.' ), |
| 294 | '<code>id</code>', |
| 295 | $sidebar['name'], |