<?php

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/**

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* Widget API: WP_Widget base class

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*

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* @package WordPress

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* @subpackage Widgets

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* @since 4.4.0

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*/

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/**

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* Core base class extended to register widgets.

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*

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* This class must be extended for each widget, and WP_Widget::widget() must be overridden.

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*

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* If adding widget options, WP_Widget::update() and WP_Widget::form() should also be overridden.

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*

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* @since 2.8.0

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* @since 4.4.0 Moved to its own file from wp-includes/widgets.php

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*/

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#[AllowDynamicProperties]

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class WP_Widget {

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/**

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* Root ID for all widgets of this type.

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*

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* @since 2.8.0

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* @var mixed|string

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*/

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public $id_base;

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/**

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* Name for this widget type.

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*

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* @since 2.8.0

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* @var string

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*/

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public $name;

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/**

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* Option name for this widget type.

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*

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* @since 2.8.0

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* @var string

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*/

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public $option_name;

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/**

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* Alt option name for this widget type.

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*

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* @since 2.8.0

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* @var string

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*/

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public $alt_option_name;

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/**

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* Option array passed to wp_register_sidebar_widget().

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*

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* @since 2.8.0

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* @var array

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*/

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public $widget_options;

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/**

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* Option array passed to wp_register_widget_control().

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*

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* @since 2.8.0

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* @var array

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*/

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public $control_options;

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/**

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* Unique ID number of the current instance.

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*

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* @since 2.8.0

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* @var bool|int

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*/

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public $number = false;

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/**

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* Unique ID string of the current instance (id_base-number).

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*

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* @since 2.8.0

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* @var bool|string

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*/

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public $id = false;

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/**

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* Whether the widget data has been updated.

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*

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* Set to true when the data is updated after a POST submit - ensures it does

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* not happen twice.

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*

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* @since 2.8.0

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* @var bool

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*/

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public $updated = false;

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//

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// Member functions that must be overridden by subclasses.

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//

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/**

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* Echoes the widget content.

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*

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* Subclasses should override this function to generate their widget code.

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*

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* @since 2.8.0

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*

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* @param array $args Display arguments including 'before_title', 'after_title',

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* 'before_widget', and 'after_widget'.

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* @param array $instance The settings for the particular instance of the widget.

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*/

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public function widget( $args, $instance ) {

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die( 'function WP_Widget::widget() must be overridden in a subclass.' );

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}

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/**

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* Updates a particular instance of a widget.

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*

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* This function should check that `$new_instance` is set correctly. The newly-calculated

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* value of `$instance` should be returned. If false is returned, the instance won't be

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* saved/updated.

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*

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* @since 2.8.0

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*

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* @param array $new_instance New settings for this instance as input by the user via

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* WP_Widget::form().

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* @param array $old_instance Old settings for this instance.

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* @return array Settings to save or bool false to cancel saving.

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*/

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public function update( $new_instance, $old_instance ) {

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return $new_instance;

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}

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/**

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* Outputs the settings update form.

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*

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* @since 2.8.0

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*

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* @param array $instance Current settings.

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* @return string Default return is 'noform'.

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*/

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public function form( $instance ) {

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echo '<p class="no-options-widget">' . __( 'There are no options for this widget.' ) . '</p>';

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return 'noform';

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}

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// Functions you'll need to call.

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/**

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* PHP5 constructor.

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*

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* @since 2.8.0

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*

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* @param string $id_base Base ID for the widget, lowercase and unique. If left empty,

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* a portion of the widget's PHP class name will be used. Has to be unique.

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* @param string $name Name for the widget displayed on the configuration page.

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* @param array $widget_options Optional. Widget options. See wp_register_sidebar_widget() for

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* information on accepted arguments. Default empty array.

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* @param array $control_options Optional. Widget control options. See wp_register_widget_control() for

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* information on accepted arguments. Default empty array.

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*/

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public function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {

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if ( ! empty( $id_base ) ) {

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$id_base = strtolower( $id_base );

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} else {

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$id_base = preg_replace( '/(wp_)?widget_/', '', strtolower( get_class( $this ) ) );

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}

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$this->id_base = $id_base;

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$this->name = $name;

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$this->option_name = 'widget_' . $this->id_base;

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$this->widget_options = wp_parse_args(

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$widget_options,

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array(

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'classname' => str_replace( '\\', '_', $this->option_name ),

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'customize_selective_refresh' => false,

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)

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);

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$this->control_options = wp_parse_args( $control_options, array( 'id_base' => $this->id_base ) );

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}

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/**

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* PHP4 constructor.

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*

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* @since 2.8.0

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* @deprecated 4.3.0 Use __construct() instead.

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*

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* @see WP_Widget::__construct()

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*

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* @param string $id_base Base ID for the widget, lowercase and unique. If left empty,

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* a portion of the widget's PHP class name will be used. Has to be unique.

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* @param string $name Name for the widget displayed on the configuration page.

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* @param array $widget_options Optional. Widget options. See wp_register_sidebar_widget() for

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* information on accepted arguments. Default empty array.

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* @param array $control_options Optional. Widget control options. See wp_register_widget_control() for

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* information on accepted arguments. Default empty array.

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*/

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public function WP_Widget( $id_base, $name, $widget_options = array(), $control_options = array() ) {

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_deprecated_constructor( 'WP_Widget', '4.3.0', get_class( $this ) );

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WP_Widget::__construct( $id_base, $name, $widget_options, $control_options );

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}

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/**

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* Constructs name attributes for use in form() fields

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*

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* This function should be used in form() methods to create name attributes for fields

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* to be saved by update()

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*

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* @since 2.8.0

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* @since 4.4.0 Array format field names are now accepted.

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*

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* @param string $field_name Field name.

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* @return string Name attribute for `$field_name`.

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*/

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public function get_field_name( $field_name ) {

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$pos = strpos( $field_name, '[' );

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if ( false !== $pos ) {

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// Replace the first occurrence of '[' with ']['.

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$field_name = '[' . substr_replace( $field_name, '][', $pos, strlen( '[' ) );

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} else {

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$field_name = '[' . $field_name . ']';

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}

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return 'widget-' . $this->id_base . '[' . $this->number . ']' . $field_name;

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}

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/**

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* Constructs id attributes for use in WP_Widget::form() fields.

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*

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* This function should be used in form() methods to create id attributes

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* for fields to be saved by WP_Widget::update().

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*

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* @since 2.8.0

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* @since 4.4.0 Array format field IDs are now accepted.

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*

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* @param string $field_name Field name.

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* @return string ID attribute for `$field_name`.

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*/

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public function get_field_id( $field_name ) {

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$field_name = str_replace( array( '[]', '[', ']' ), array( '', '-', '' ), $field_name );

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$field_name = trim( $field_name, '-' );

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return 'widget-' . $this->id_base . '-' . $this->number . '-' . $field_name;

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}

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/**

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* Register all widget instances of this widget class.

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*

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* @since 2.8.0

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*/

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public function _register() {

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$settings = $this->get_settings();

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$empty = true;

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// When $settings is an array-like object, get an intrinsic array for use with array_keys().

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if ( $settings instanceof ArrayObject || $settings instanceof ArrayIterator ) {

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$settings = $settings->getArrayCopy();

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}

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if ( is_array( $settings ) ) {

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foreach ( array_keys( $settings ) as $number ) {

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if ( is_numeric( $number ) ) {

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$this->_set( $number );

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$this->_register_one( $number );

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$empty = false;

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}

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}

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}

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if ( $empty ) {

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// If there are none, we register the widget's existence with a generic template.

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$this->_set( 1 );

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$this->_register_one();

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}

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}

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/**

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* Sets the internal order number for the widget instance.

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*

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* @since 2.8.0

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*

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* @param int $number The unique order number of this widget instance compared to other

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* instances of the same class.

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*/

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public function _set( $number ) {

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$this->number = $number;

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$this->id = $this->id_base . '-' . $number;

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}

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/**

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* Retrieves the widget display callback.

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*

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* @since 2.8.0

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*

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* @return callable Display callback.

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*/

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public function _get_display_callback() {

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return array( $this, 'display_callback' );

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}

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/**

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* Retrieves the widget update callback.

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*

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* @since 2.8.0

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*

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* @return callable Update callback.

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*/

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public function _get_update_callback() {

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return array( $this, 'update_callback' );

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}

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/**

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* Retrieves the form callback.

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*

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* @since 2.8.0

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*

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* @return callable Form callback.

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*/

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public function _get_form_callback() {

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return array( $this, 'form_callback' );

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}

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/**

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* Determines whether the current request is inside the Customizer preview.

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*

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* If true -- the current request is inside the Customizer preview, then

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* the object cache gets suspended and widgets should check this to decide

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* whether they should store anything persistently to the object cache,

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* to transients, or anywhere else.

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*

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* @since 3.9.0

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*

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* @global WP_Customize_Manager $wp_customize

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*

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* @return bool True if within the Customizer preview, false if not.

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*/

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public function is_preview() {

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global $wp_customize;

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return ( isset( $wp_customize ) && $wp_customize->is_preview() );

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}

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/**

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* Generates the actual widget content (Do NOT override).

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*

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* Finds the instance and calls WP_Widget::widget().

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*

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* @since 2.8.0

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*

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* @param array $args Display arguments. See WP_Widget::widget() for information

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* on accepted arguments.

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* @param int|array $widget_args {

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* Optional. Internal order number of the widget instance, or array of multi-widget arguments.

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* Default 1.

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*

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* @type int $number Number increment used for multiples of the same widget.

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* }

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*/

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public function display_callback( $args, $widget_args = 1 ) {

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if ( is_numeric( $widget_args ) ) {

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$widget_args = array( 'number' => $widget_args );

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}

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$widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );

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$this->_set( $widget_args['number'] );

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$instances = $this->get_settings();

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if ( isset( $instances[ $this->number ] ) ) {

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$instance = $instances[ $this->number ];

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/**

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* Filters the settings for a particular widget instance.

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*

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* Returning false will effectively short-circuit display of the widget.

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*

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* @since 2.8.0

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*

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* @param array $instance The current widget instance's settings.

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* @param WP_Widget $widget The current widget instance.

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* @param array $args An array of default widget arguments.

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*/

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$instance = apply_filters( 'widget_display_callback', $instance, $this, $args );

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if ( false === $instance ) {

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return;

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}

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$was_cache_addition_suspended = wp_suspend_cache_addition();

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if ( $this->is_preview() && ! $was_cache_addition_suspended ) {

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wp_suspend_cache_addition( true );

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}

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$this->widget( $args, $instance );

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if ( $this->is_preview() ) {

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wp_suspend_cache_addition( $was_cache_addition_suspended );

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}

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}

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}

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/**

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* Handles changed settings (Do NOT override).

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*

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* @since 2.8.0

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*

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* @global array $wp_registered_widgets

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*

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* @param int $deprecated Not used.

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*/

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public function update_callback( $deprecated = 1 ) {

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global $wp_registered_widgets;

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$all_instances = $this->get_settings();

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// We need to update the data.

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if ( $this->updated ) {

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return;

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}

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if ( isset( $_POST['delete_widget'] ) && $_POST['delete_widget'] ) {

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// Delete the settings for this instance of the widget.

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if ( isset( $_POST['the-widget-id'] ) ) {

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$del_id = $_POST['the-widget-id'];

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} else {

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return;

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}

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if ( isset( $wp_registered_widgets[ $del_id ]['params'][0]['number'] ) ) {

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$number = $wp_registered_widgets[ $del_id ]['params'][0]['number'];

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if ( $this->id_base . '-' . $number === $del_id ) {

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unset( $all_instances[ $number ] );

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}

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}

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} else {

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if ( isset( $_POST[ 'widget-' . $this->id_base ] ) && is_array( $_POST[ 'widget-' . $this->id_base ] ) ) {

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$settings = $_POST[ 'widget-' . $this->id_base ];

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} elseif ( isset( $_POST['id_base'] ) && $_POST['id_base'] === $this->id_base ) {

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$num = $_POST['multi_number'] ? (int) $_POST['multi_number'] : (int) $_POST['widget_number'];

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$settings = array( $num => array() );

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} else {

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return;

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}

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foreach ( $settings as $number => $new_instance ) {

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$new_instance = stripslashes_deep( $new_instance );

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$this->_set( $number );

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$old_instance = isset( $all_instances[ $number ] ) ? $all_instances[ $number ] : array();

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$was_cache_addition_suspended = wp_suspend_cache_addition();

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if ( $this->is_preview() && ! $was_cache_addition_suspended ) {

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wp_suspend_cache_addition( true );

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}

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$instance = $this->update( $new_instance, $old_instance );

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if ( $this->is_preview() ) {

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wp_suspend_cache_addition( $was_cache_addition_suspended );

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}

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/**

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* Filters a widget's settings before saving.

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*

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* Returning false will effectively short-circuit the widget's ability

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* to update settings.

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*

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* @since 2.8.0

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*

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* @param array $instance The current widget instance's settings.

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* @param array $new_instance Array of new widget settings.

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* @param array $old_instance Array of old widget settings.

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* @param WP_Widget $widget The current widget instance.

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*/

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$instance = apply_filters( 'widget_update_callback', $instance, $new_instance, $old_instance, $this );

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if ( false !== $instance ) {

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$all_instances[ $number ] = $instance;

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}

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break; // Run only once.

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}

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}

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$this->save_settings( $all_instances );

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$this->updated = true;

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}

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/**

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* Generates the widget control form (Do NOT override).

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*

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* @since 2.8.0

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*

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* @param int|array $widget_args {

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* Optional. Internal order number of the widget instance, or array of multi-widget arguments.

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* Default 1.

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*

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* @type int $number Number increment used for multiples of the same widget.

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* }

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