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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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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 | /** This action is documented in wp-admin/custom-header.php */ |
389 | do_action( 'wp_create_file_in_uploads', $file, $id ); // For replication |
390 | $this->updated = true; |
391 | } |
392 |
|
393 | /** |
394 | * Unused since 3.5.0. |
395 | * |
396 | * @since 3.4.0 |
397 | */ |
398 | function attachment_fields_to_edit( $form_fields ) { |