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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 |
|---|---|
| 347 | // Add the meta-data |
| 348 | wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) ); |
| 349 | update_post_meta( $id, '_wp_attachment_is_custom_background', get_option('stylesheet' ) ); |
| 350 | |
| 351 | set_theme_mod('background_image', esc_url($url)); |
| 352 | |
| 353 | $thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' ); |
| 354 | set_theme_mod('background_image_thumb', esc_url( $thumbnail[0] ) ); |
| 355 | |
| 356 | do_action('wp_create_file_in_uploads', $file, $id); // For replication |
| 357 | $this->updated = true; |
| 358 | } |
| 359 | |
| 360 | } |
| 361 | ?> |
| 362 | |