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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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541 | /** |
542 | * |
543 | * @since 3.4.0 |
544 | * @deprecated 3.5.0 |
545 | */ |
546 | public function wp_set_background_image() { |
547 | if ( ! current_user_can('edit_theme_options') || ! isset( $_POST['attachment_id'] ) ) exit; |
548 | $attachment_id = absint($_POST['attachment_id']); |
549 | /** This filter is documented in wp-admin/includes/media.php */ |
550 | $sizes = array_keys(apply_filters( 'image_size_names_choose', array('thumbnail' => __('Thumbnail'), 'medium' => __('Medium'), 'large' => __('Large'), 'full' => __('Full Size')) )); |
551 | $size = 'thumbnail'; |
552 | if ( in_array( $_POST['size'], $sizes ) ) |
553 | $size = esc_attr( $_POST['size'] ); |
554 |
|
555 | update_post_meta( $attachment_id, '_wp_attachment_is_custom_background', get_option('stylesheet' ) ); |
556 | $url = wp_get_attachment_image_src( $attachment_id, $size ); |
557 | $thumbnail = wp_get_attachment_image_src( $attachment_id, 'thumbnail' ); |
558 | set_theme_mod( 'background_image', esc_url_raw( $url[0] ) ); |
559 | set_theme_mod( 'background_image_thumb', esc_url_raw( $thumbnail[0] ) ); |