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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 |
|---|---|
| 288 | /** |
| 289 | * Filters whether the users being deleted have additional content |
| 290 | * associated with them outside of the `post_author` and `link_owner` relationships. |
| 291 | * |
| 292 | * @since 5.2.0 |
| 293 | * |
| 294 | * @param bool $users_have_additional_content Whether the users have additional content. Default false. |
| 295 | * @param int[] $userids Array of IDs for users being deleted. |
| 296 | */ |
| 297 | $users_have_content = (bool) apply_filters( 'users_have_additional_content', false, $userids ); |
| 298 | |
| 299 | if ( $userids && ! $users_have_content ) { |
| 300 | if ( $wpdb->get_var( "SELECT ID FROM {$wpdb->posts} WHERE post_author IN( " . implode( ',', $userids ) . ' ) LIMIT 1' ) ) { |
| 301 | $users_have_content = true; |
| 302 | } elseif ( $wpdb->get_var( "SELECT link_id FROM {$wpdb->links} WHERE link_owner IN( " . implode( ',', $userids ) . ' ) LIMIT 1' ) ) { |
| 303 | $users_have_content = true; |
| 304 | } |
| 305 | } |
| 306 | |