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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 |
|---|---|
| 193 | $messages['attachment'] = array_fill( 1, 10, __( 'Media file updated.' ) ); // Hack, for now. |
| 194 | |
| 195 | /** |
| 196 | * Filters the post updated messages. |
| 197 | * |
| 198 | * @since 3.0.0 |
| 199 | * |
| 200 | * @param array[] $messages Post updated messages. For defaults see `$messages` declarations above. |
| 201 | */ |
| 202 | $messages = apply_filters( 'post_updated_messages', $messages ); |
| 203 | |
| 204 | $message = false; |
| 205 | if ( isset( $_GET['message'] ) ) { |
| 206 | $_GET['message'] = absint( $_GET['message'] ); |
| 207 | if ( isset( $messages[ $post_type ][ $_GET['message'] ] ) ) { |
| 208 | $message = $messages[ $post_type ][ $_GET['message'] ]; |
| 209 | } elseif ( ! isset( $messages[ $post_type ] ) && isset( $messages['post'][ $_GET['message'] ] ) ) { |
| 210 | $message = $messages['post'][ $_GET['message'] ]; |
| 211 | } |