/**
* Look for "lost" widgets, this has to run at least on each theme change.
*
* @since 2.8.0
*
* @param mixed $theme_changed Whether the theme was changed as a boolean. A value
* of 'customize' defers updates for the customizer.
* @return array
*/
function retrieve_widgets( $theme_changed = false ) {
global $wp_registered_sidebars, $sidebars_widgets, $wp_registered_widgets;
$registered_sidebar_keys = array_keys( $wp_registered_sidebars );
$orphaned = 0;
$old_sidebars_widgets = get_theme_mod( 'sidebars_widgets' );
if ( is_array( $old_sidebars_widgets ) ) {
// time() that sidebars were stored is in $old_sidebars_widgets['time']
$_sidebars_widgets = $old_sidebars_widgets['data'];
if ( 'customize' !== $theme_changed ) {
remove_theme_mod( 'sidebars_widgets' );
}
foreach ( $_sidebars_widgets as $sidebar => $widgets ) {
if ( 'wp_inactive_widgets' === $sidebar || 'orphaned_widgets' === substr( $sidebar, 0, 16 ) ) {
continue;
}
if ( !in_array( $sidebar, $registered_sidebar_keys ) ) {
$_sidebars_widgets['orphaned_widgets_' . ++$orphaned] = $widgets;
unset( $_sidebars_widgets[$sidebar] );
}
}
} else {
if ( empty( $sidebars_widgets ) )
return;
unset( $sidebars_widgets['array_version'] );
$old = array_keys($sidebars_widgets);
sort($old);
sort($registered_sidebar_keys);
if ( $old == $registered_sidebar_keys )
return;
$_sidebars_widgets = array(
'wp_inactive_widgets' => !empty( $sidebars_widgets['wp_inactive_widgets'] ) ? $sidebars_widgets['wp_inactive_widgets'] : array()
);
unset( $sidebars_widgets['wp_inactive_widgets'] );
foreach ( $wp_registered_sidebars as $id => $settings ) {
if ( $theme_changed ) {
$_sidebars_widgets[$id] = array_shift( $sidebars_widgets );
} else {
// no theme change, grab only sidebars that are currently registered
if ( isset( $sidebars_widgets[$id] ) ) {
$_sidebars_widgets[$id] = $sidebars_widgets[$id];
unset( $sidebars_widgets[$id] );
}
}
}
foreach ( $sidebars_widgets as $val ) {
if ( is_array($val) && ! empty( $val ) )
$_sidebars_widgets['orphaned_widgets_' . ++$orphaned] = $val;
}
}
// discard invalid, theme-specific widgets from sidebars
$shown_widgets = array();
foreach ( $_sidebars_widgets as $sidebar => $widgets ) {
if ( !is_array($widgets) )
continue;
$_widgets = array();
foreach ( $widgets as $widget ) {
if ( isset($wp_registered_widgets[$widget]) )
$_widgets[] = $widget;
}
$_sidebars_widgets[$sidebar] = $_widgets;
$shown_widgets = array_merge($shown_widgets, $_widgets);
}
$sidebars_widgets = $_sidebars_widgets;
unset($_sidebars_widgets, $_widgets);
// find hidden/lost multi-widget instances
$lost_widgets = array();
foreach ( $wp_registered_widgets as $key => $val ) {
if ( in_array($key, $shown_widgets, true) )
continue;
$number = preg_replace('/.+?-([0-9]+)$/', '$1', $key);
if ( 2 > (int) $number )
continue;
$lost_widgets[] = $key;
}
$sidebars_widgets['wp_inactive_widgets'] = array_merge($lost_widgets, (array) $sidebars_widgets['wp_inactive_widgets']);
if ( 'customize' !== $theme_changed ) {
wp_set_sidebars_widgets( $sidebars_widgets );
}
return $sidebars_widgets;
}
