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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 |
|---|---|
| 552 | wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) ); |
| 553 | update_post_meta( $id, '_wp_attachment_is_custom_background', get_option( 'stylesheet' ) ); |
| 554 | |
| 555 | set_theme_mod( 'background_image', sanitize_url( $url ) ); |
| 556 | |
| 557 | $thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' ); |
| 558 | set_theme_mod( 'background_image_thumb', sanitize_url( $thumbnail[0] ) ); |
| 559 | |
| 560 | /** This action is documented in wp-admin/includes/class-custom-image-header.php */ |
| 561 | do_action( 'wp_create_file_in_uploads', $file, $id ); // For replication. |
| 562 | $this->updated = true; |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * Handles Ajax request for adding custom background context to an attachment. |
| 567 | * |
| 568 | * Triggers when the user adds a new background image from the |
| 569 | * Media Manager. |
| 570 | * |