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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 |
|---|---|
| 411 | * @since 3.4.0 |
| 412 | */ |
| 413 | function filter_upload_tabs() { |
| 414 | return array( 'library' => __('Media Library') ); |
| 415 | } |
| 416 | |
| 417 | public function wp_set_background_image() { |
| 418 | if ( ! current_user_can('edit_theme_options') || ! isset( $_POST['attachment_id'] ) ) exit; |
| 419 | $attachment_id = absint($_POST['attachment_id']); |
| 420 | $sizes = array_keys(apply_filters( 'image_size_names_choose', array('thumbnail' => __('Thumbnail'), 'medium' => __('Medium'), 'large' => __('Large'), 'full' => __('Full Size')) )); |
| 421 | $size = 'thumbnail'; |
| 422 | if ( in_array( $_POST['size'], $sizes ) ) |
| 423 | $size = esc_attr( $_POST['size'] ); |
| 424 | |
| 425 | update_post_meta( $attachment_id, '_wp_attachment_is_custom_background', get_option('stylesheet' ) ); |
| 426 | $url = wp_get_attachment_image_src( $attachment_id, $size ); |
| 427 | $thumbnail = wp_get_attachment_image_src( $attachment_id, 'thumbnail' ); |
| 428 | set_theme_mod( 'background_image', esc_url_raw( $url[0] ) ); |
| 429 | set_theme_mod( 'background_image_thumb', esc_url_raw( $thumbnail[0] ) ); |