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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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382 | // Add the meta-data |
383 | wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) ); |
384 | update_post_meta( $id, '_wp_attachment_is_custom_background', get_option('stylesheet' ) ); |
385 |
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386 | set_theme_mod('background_image', esc_url_raw($url)); |
387 |
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388 | $thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' ); |
389 | set_theme_mod('background_image_thumb', esc_url_raw( $thumbnail[0] ) ); |
390 |
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391 | do_action('wp_create_file_in_uploads', $file, $id); // For replication |
392 | $this->updated = true; |
393 | } |
394 |
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395 | /** |
396 | * Replace default attachment actions with "Set as background" link. |
397 | * |
398 | * @since 3.4.0 |
399 | */ |
400 | function attachment_fields_to_edit( $form_fields, $post ) { |