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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 |
|---|---|
| 379 | // Add the meta-data |
| 380 | wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) ); |
| 381 | update_post_meta( $id, '_wp_attachment_is_custom_background', get_option('stylesheet' ) ); |
| 382 | |
| 383 | set_theme_mod('background_image', esc_url_raw($url)); |
| 384 | |
| 385 | $thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' ); |
| 386 | set_theme_mod('background_image_thumb', esc_url_raw( $thumbnail[0] ) ); |
| 387 | |
| 388 | do_action('wp_create_file_in_uploads', $file, $id); // For replication |
| 389 | $this->updated = true; |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * Unused since 3.5.0. |
| 394 | * |
| 395 | * @since 3.4.0 |
| 396 | */ |
| 397 | function attachment_fields_to_edit( $form_fields ) { |