Source
File: wp-includes/class-wp-customize-widgets.php
public function render_widget_partial( $partial, $context ) {
$id_data = $partial->id_data();
$widget_id = array_shift( $id_data['keys'] );
if ( ! is_array( $context )
|| empty( $context['sidebar_id'] )
|| ! is_registered_sidebar( $context['sidebar_id'] )
) {
return false;
}
$this->rendering_sidebar_id = $context['sidebar_id'];
if ( isset( $context['sidebar_instance_number'] ) ) {
$this->context_sidebar_instance_number = intval( $context['sidebar_instance_number'] );
}
// Filter sidebars_widgets so that only the queried widget is in the sidebar.
$this->rendering_widget_id = $widget_id;
$filter_callback = array( $this, 'filter_sidebars_widgets_for_rendering_widget' );
add_filter( 'sidebars_widgets', $filter_callback, 1000 );
// Render the widget.
ob_start();
$this->rendering_sidebar_id = $context['sidebar_id'];
dynamic_sidebar( $this->rendering_sidebar_id );
$container = ob_get_clean();
// Reset variables for next partial render.
remove_filter( 'sidebars_widgets', $filter_callback, 1000 );
$this->context_sidebar_instance_number = null;
$this->rendering_sidebar_id = null;
$this->rendering_widget_id = null;
return $container;
}