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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 |
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512 | wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) ); |
513 | update_post_meta( $id, '_wp_attachment_is_custom_background', get_option( 'stylesheet' ) ); |
514 |
|
515 | set_theme_mod( 'background_image', esc_url_raw( $url ) ); |
516 |
|
517 | $thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' ); |
518 | set_theme_mod( 'background_image_thumb', esc_url_raw( $thumbnail[0] ) ); |
519 |
|
520 | /** This action is documented in wp-admin/custom-header.php */ |
521 | do_action( 'wp_create_file_in_uploads', $file, $id ); // For replication |
522 | $this->updated = true; |
523 | } |
524 |
|
525 | /** |
526 | * Ajax handler for adding custom background context to an attachment. |
527 | * |
528 | * Triggers when the user adds a new background image from the |
529 | * Media Manager. |
530 | * |