Source
File: wp-includes/class-wp-widget.php
public function update_callback( $deprecated = 1 ) {
global $wp_registered_widgets;
$all_instances = $this->get_settings();
// We need to update the data.
if ( $this->updated ) {
return;
}
if ( isset( $_POST['delete_widget'] ) && $_POST['delete_widget'] ) {
// Delete the settings for this instance of the widget.
if ( isset( $_POST['the-widget-id'] ) ) {
$del_id = $_POST['the-widget-id'];
} else {
return;
}
if ( isset( $wp_registered_widgets[ $del_id ]['params'][0]['number'] ) ) {
$number = $wp_registered_widgets[ $del_id ]['params'][0]['number'];
if ( $this->id_base . '-' . $number == $del_id ) {
unset( $all_instances[ $number ] );
}
}
} else {
if ( isset( $_POST[ 'widget-' . $this->id_base ] ) && is_array( $_POST[ 'widget-' . $this->id_base ] ) ) {
$settings = $_POST[ 'widget-' . $this->id_base ];
} elseif ( isset( $_POST['id_base'] ) && $_POST['id_base'] == $this->id_base ) {
$num = $_POST['multi_number'] ? (int) $_POST['multi_number'] : (int) $_POST['widget_number'];
$settings = array( $num => array() );
} else {
return;
}
foreach ( $settings as $number => $new_instance ) {
$new_instance = stripslashes_deep( $new_instance );
$this->_set( $number );
$old_instance = isset( $all_instances[ $number ] ) ? $all_instances[ $number ] : array();
$was_cache_addition_suspended = wp_suspend_cache_addition();
if ( $this->is_preview() && ! $was_cache_addition_suspended ) {
wp_suspend_cache_addition( true );
}
$instance = $this->update( $new_instance, $old_instance );
if ( $this->is_preview() ) {
wp_suspend_cache_addition( $was_cache_addition_suspended );
}
/**
* Filters a widget's settings before saving.
*
* Returning false will effectively short-circuit the widget's ability
* to update settings.
*
* @since 2.8.0
*
* @param array $instance The current widget instance's settings.
* @param array $new_instance Array of new widget settings.
* @param array $old_instance Array of old widget settings.
* @param WP_Widget $this The current widget instance.
*/
$instance = apply_filters( 'widget_update_callback', $instance, $new_instance, $old_instance, $this );
if ( false !== $instance ) {
$all_instances[ $number ] = $instance;
}
break; // Run only once.
}
}
$this->save_settings( $all_instances );
$this->updated = true;
}