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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 |
|---|---|
| 399 | wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) ); |
| 400 | update_post_meta( $id, '_wp_attachment_is_custom_background', get_option('stylesheet' ) ); |
| 401 | |
| 402 | set_theme_mod('background_image', esc_url_raw($url)); |
| 403 | |
| 404 | $thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' ); |
| 405 | set_theme_mod('background_image_thumb', esc_url_raw( $thumbnail[0] ) ); |
| 406 | |
| 407 | /** This action is documented in wp-admin/custom-header.php */ |
| 408 | do_action( 'wp_create_file_in_uploads', $file, $id ); // For replication |
| 409 | $this->updated = true; |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * Ajax handler for adding custom background context to an attachment. |
| 414 | * |
| 415 | * Triggered when the user adds a new background image from the |
| 416 | * Media Manager. |
| 417 | * |