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<?php
/**
* API for creating dynamic sidebar without hardcoding functionality into
* themes. Includes both internal WordPress routines and theme use routines.
*
* This functionality was found in a plugin before WordPress 2.2 release which
* included it in the core from that point on.
*
* @link http://codex.wordpress.org/Plugins/WordPress_Widgets WordPress Widgets
* @link http://codex.wordpress.org/Plugins/WordPress_Widgets_Api Widgets API
*
* @package WordPress
* @subpackage Widgets
*/
/**
* This class must be extended for each widget and WP_Widget::widget(), WP_Widget::update()
* and WP_Widget::form() need to be over-ridden.
*
* @package WordPress
* @subpackage Widgets
* @since 2.8
*/
class WP_Widget {
var $id_base; // Root id for all widgets of this type.
var $name; // Name for this widget type.
var $widget_options; // Option array passed to wp_register_sidebar_widget()
var $control_options; // Option array passed to wp_register_widget_control()
var $number = false; // Unique ID number of the current instance.
var $id = false; // Unique ID string of the current instance (id_base-number)
var $updated = false; // Set true when we update the data after a POST submit - makes sure we don't do it twice.
// Member functions that you must over-ride.
/** Echo the widget content.
*
* Subclasses should over-ride this function to generate their widget code.
*
* @param array $args Display arguments including before_title, after_title, before_widget, and after_widget.
* @param array $instance The settings for the particular instance of the widget
*/
function widget($args, $instance) {
die('function WP_Widget::widget() must be over-ridden in a sub-class.');
}
/** Update a particular instance.
*
* This function should check that $new_instance is set correctly.
* The newly calculated value of $instance should be returned.
* If "false" is returned, the instance won't be saved/updated.
*
* @param array $new_instance New settings for this instance as input by the user via form()
* @param array $old_instance Old settings for this instance
* @return array Settings to save or bool false to cancel saving
*/
function update($new_instance, $old_instance) {
return $new_instance;
}
/** Echo the settings update form
*
* @param array $instance Current settings
*/
function form($instance) {
echo '<p class="no-options-widget">' . __('There are no options for this widget.') . '</p>';
return 'noform';
}
// Functions you'll need to call.
/**
* PHP5 constructor
*
* @param string $id_base Optional Base ID for the widget, lower case,
* if left empty a portion of the widget's class name will be used. Has to be unique.
* @param string $name Name for the widget displayed on the configuration page.
* @param array $widget_options Optional Passed to wp_register_sidebar_widget()
* - description: shown on the configuration page
* - classname
* @param array $control_options Optional Passed to wp_register_widget_control()
* - width: required if more than 250px
* - height: currently not used but may be needed in the future
*/
function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {
$this->id_base = empty($id_base) ? preg_replace( '/(wp_)?widget_/', '', strtolower(get_class($this)) ) : strtolower($id_base);
$this->name = $name;
$this->option_name = 'widget_' . $this->id_base;
$this->widget_options = wp_parse_args( $widget_options, array('classname' => $this->option_name) );
$this->control_options = wp_parse_args( $control_options, array('id_base' => $this->id_base) );
}
/**
* PHP4 constructor
*/
function WP_Widget( $id_base, $name, $widget_options = array(), $control_options = array() ) {
WP_Widget::__construct( $id_base, $name, $widget_options, $control_options );
}
/**
* Constructs name attributes for use in form() fields
*
* This function should be used in form() methods to create name attributes for fields to be saved by update()
*
* @param string $field_name Field name
* @return string Name attribute for $field_name
*/
function get_field_name($field_name) {
return 'widget-' . $this->id_base . '[' . $this->number . '][' . $field_name . ']';
}
/**
* Constructs id attributes for use in form() fields
*
* This function should be used in form() methods to create id attributes for fields to be saved by update()
*
* @param string $field_name Field name
* @return string ID attribute for $field_name
*/
function get_field_id($field_name) {
return 'widget-' . $this->id_base . '-' . $this->number . '-' . $field_name;
}
// Private Functions. Don't worry about these.
function _register() {
$settings = $this->get_settings();
$empty = true;
if ( is_array($settings) ) {
foreach ( array_keys($settings) as $number ) {
if ( is_numeric($number) ) {
$this->_set($number);
$this->_register_one($number);
$empty = false;
}
}
}
if ( $empty ) {
// If there are none, we register the widget's existence with a
// generic template
$this->_set(1);
$this->_register_one();
}
}
function _set($number) {
$this->number = $number;
$this->id = $this->id_base . '-' . $number;
}
function _get_display_callback() {
return array($this, 'display_callback');
}
function _get_update_callback() {
return array($this, 'update_callback');
}
function _get_form_callback() {
return array($this, 'form_callback');
}
/** Generate the actual widget content.
* Just finds the instance and calls widget().
* Do NOT over-ride this function. */
function display_callback( $args, $widget_args = 1 ) {
if ( is_numeric($widget_args) )
$widget_args = array( 'number' => $widget_args );
$widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );
$this->_set( $widget_args['number'] );
$instance = $this->get_settings();
if ( array_key_exists( $this->number, $instance ) ) {
$instance = $instance[$this->number];
// filters the widget's settings, return false to stop displaying the widget
$instance = apply_filters('widget_display_callback', $instance, $this, $args);
if ( false !== $instance )
$this->widget($args, $instance);
}
}
/** Deal with changed settings.
* Do NOT over-ride this function. */
function update_callback( $widget_args = 1 ) {
global $wp_registered_widgets;
if ( is_numeric($widget_args) )
$widget_args = array( 'number' => $widget_args );
$widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );
$all_instances = $this->get_settings();
// We need to update the data
if ( $this->updated )
return;
$sidebars_widgets = wp_get_sidebars_widgets();
if ( isset($_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();
$instance = $this->update($new_instance, $old_instance);
// filters the widget's settings before saving, return false to cancel saving (keep the old settings if updating)
$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;
}
/** Generate the control form.
* Do NOT over-ride this function. */
function form_callback( $widget_args = 1 ) {
if ( is_numeric($widget_args) )
$widget_args = array( 'number' => $widget_args );
$widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );
$all_instances = $this->get_settings();
if ( -1 == $widget_args['number'] ) {
// We echo out a form where 'number' can be set later
$this->_set('__i__');
$instance = array();
} else {
$this->_set($widget_args['number']);
$instance = $all_instances[ $widget_args['number'] ];
}
// filters the widget admin form before displaying, return false to stop displaying it
$instance = apply_filters('widget_form_callback', $instance, $this);
$return = null;
if ( false !== $instance ) {
$return = $this->form($instance);
// add extra fields in the widget form - be sure to set $return to null if you add any
// if the widget has no form the text echoed from the default form method can be hidden using css
do_action_ref_array( 'in_widget_form', array(&$this, &$return, $instance) );
}
return $return;
}
/** Helper function: Registers a single instance. */
function _register_one($number = -1) {
wp_register_sidebar_widget( $this->id, $this->name, $this->_get_display_callback(), $this->widget_options, array( 'number' => $number ) );
_register_widget_update_callback( $this->id_base, $this->_get_update_callback(), $this->control_options, array( 'number' => -1 ) );
_register_widget_form_callback( $this->id, $this->name, $this->_get_form_callback(), $this->control_options, array( 'number' => $number ) );
}
function save_settings($settings) {
$settings['_multiwidget'] = 1;
update_option( $this->option_name, $settings );
}
function get_settings() {
$settings = get_option($this->option_name);
if ( false === $settings && isset($this->alt_option_name) )
$settings = get_option($this->alt_option_name);
if ( !is_array($settings) )
$settings = array();
if ( !empty($settings) && !array_key_exists('_multiwidget', $settings) ) {
// old format, convert if single widget
$settings = wp_convert_widget_settings($this->id_base, $this->option_name, $settings);
}
unset($settings['_multiwidget'], $settings['__i__']);
return $settings;
}
}
/**
* Singleton that registers and instantiates WP_Widget classes.
*
* @package WordPress
* @subpackage Widgets
* @since 2.8
*/
class WP_Widget_Factory {
var $widgets = array();
function WP_Widget_Factory() {
add_action( 'widgets_init', array( $this, '_register_widgets' ), 100 );
}
function register($widget_class) {
$this->widgets[$widget_class] = new $widget_class();
}
function unregister($widget_class) {
if ( isset($this->widgets[$widget_class]) )
unset($this->widgets[$widget_class]);
}
function _register_widgets() {
global $wp_registered_widgets;
$keys = array_keys($this->widgets);
$registered = array_keys($wp_registered_widgets);
$registered = array_map('_get_widget_id_base', $registered);
foreach ( $keys as $key ) {
// don't register new widget if old widget with the same id is already registered
if ( in_array($this->widgets[$key]->id_base, $registered, true) ) {
unset($this->widgets[$key]);
continue;
}
$this->widgets[$key]->_register();
}
}
}
/* Global Variables */
/** @ignore */
global $wp_registered_sidebars, $wp_registered_widgets, $wp_registered_widget_controls, $wp_registered_widget_updates;
/**
* Stores the sidebars, since many themes can have more than one.
*
* @global array $wp_registered_sidebars
* @since 2.2.0
*/
$wp_registered_sidebars = array();
/**
* Stores the registered widgets.
*
* @global array $wp_registered_widgets
* @since 2.2.0
*/
$wp_registered_widgets = array();
/**
* Stores the registered widget control (options).
*
* @global array $wp_registered_widget_controls
* @since 2.2.0
*/
$wp_registered_widget_controls = array();
$wp_registered_widget_updates = array();
/**
* Private
*/
$_wp_sidebars_widgets = array();
/**
* Private
*/
$GLOBALS['_wp_deprecated_widgets_callbacks'] = array(
'wp_widget_pages',
'wp_widget_pages_control',
'wp_widget_calendar',
'wp_widget_calendar_control',
'wp_widget_archives',
'wp_widget_archives_control',
'wp_widget_links',
'wp_widget_meta',
'wp_widget_meta_control',
'wp_widget_search',
'wp_widget_recent_entries',
'wp_widget_recent_entries_control',
'wp_widget_tag_cloud',
'wp_widget_tag_cloud_control',
'wp_widget_categories',
'wp_widget_categories_control',
'wp_widget_text',
'wp_widget_text_control',
'wp_widget_rss',
'wp_widget_rss_control',
'wp_widget_recent_comments',
'wp_widget_recent_comments_control'
);
/* Template tags & API functions */
/**
* Register a widget
*
* Registers a WP_Widget widget
*
* @since 2.8.0
*
* @see WP_Widget
* @see WP_Widget_Factory
* @uses WP_Widget_Factory
*
* @param string $widget_class The name of a class that extends WP_Widget
*/
function register_widget($widget_class) {
global $wp_widget_factory;
$wp_widget_factory->register($widget_class);
}
/**
* Unregister a widget
*
* Unregisters a WP_Widget widget. Useful for unregistering default widgets.
* Run within a function hooked to the widgets_init action.
*
* @since 2.8.0
*
* @see WP_Widget
* @see WP_Widget_Factory
* @uses WP_Widget_Factory
*
* @param string $widget_class The name of a class that extends WP_Widget
*/
function unregister_widget($widget_class) {
global $wp_widget_factory;
$wp_widget_factory->unregister($widget_class);
}
/**
* Creates multiple sidebars.
*
* If you wanted to quickly create multiple sidebars for a theme or internally.
* This function will allow you to do so. If you don't pass the 'name' and/or
* 'id' in $args, then they will be built for you.
*
* The default for the name is "Sidebar #", with '#' being replaced with the
* number the sidebar is currently when greater than one. If first sidebar, the
* name will be just "Sidebar". The default for id is "sidebar-" followed by the
* number the sidebar creation is currently at. If the id is provided, and multiple
* sidebars are being defined, the id will have "-2" appended, and so on.
*
* @since 2.2.0
*
* @see register_sidebar() The second parameter is documented by register_sidebar() and is the same here.
* @uses parse_str() Converts a string to an array to be used in the rest of the function.
* @uses register_sidebar() Sends single sidebar information [name, id] to this
* function to handle building the sidebar.
*
* @param int $number Number of sidebars to create.
* @param string|array $args Builds Sidebar based off of 'name' and 'id' values.
*/
function register_sidebars($number = 1, $args = array()) {
global $wp_registered_sidebars;
$number = (int) $number;
if ( is_string($args) )
parse_str($args, $args);
for ( $i = 1; $i <= $number; $i++ ) {
$_args = $args;
if ( $number > 1 )
$_args['name'] = isset($args['name']) ? sprintf($args['name'], $i) : sprintf(__('Sidebar %d'), $i);
else
$_args['name'] = isset($args['name']) ? $args['name'] : __('Sidebar');
// Custom specified ID's are suffixed if they exist already.
// Automatically generated sidebar names need to be suffixed regardless starting at -0
if ( isset($args['id']) ) {
$_args['id'] = $args['id'];
$n = 2; // Start at -2 for conflicting custom ID's
while ( isset($wp_registered_sidebars[$_args['id']]) )
$_args['id'] = $args['id'] . '-' . $n++;
} else {
$n = count($wp_registered_sidebars);
do {
$_args['id'] = 'sidebar-' . ++$n;
} while ( isset($wp_registered_sidebars[$_args['id']]) );
}
register_sidebar($_args);
}
}
/**
* Builds the definition for a single sidebar and returns the ID.
*
* Accepts either a string or an array and then parses that against a set
* of default arguments for the new sidebar. WordPress will automatically
* generate a sidebar ID and name based on the current number of registered
* sidebars if those arguments are not included.
*
* When allowing for automatic generation of the name and ID parameters, keep
* in mind that the incrementor for your sidebar can change over time depending
* on what other plugins and themes are installed.
*
* If theme support for 'widgets' has not yet been added when this function is
* called, it will be automatically enabled through the use of add_theme_support()
*
* Arguments passed as a string should be separated by '&':
*
* e.g. 'name=Sidebar&id=my_prefix_sidebar'
*
* The same arguments passed as an array:
*
* array(
* 'name' => 'Sidebar',
* 'id' => 'my_prefix_sidebar',
* )
*
* Arguments:
* name - The name or title of the sidebar displayed in the admin dashboard.
* id - The unique identifier by which the sidebar will be called.
* before_widget - HTML content that will be prepended to each widget's HTML output
* when assigned to this sidebar.
* after_widget - HTML content that will be appended to each widget's HTML output
* when assigned to this sidebar.
* before_title - HTML content that will be prepended to the sidebar title when displayed.
* after_title - HTML content that will be appended to the sidebar title when displayed.
*
* @since 2.2.0
* @uses $wp_registered_sidebars Stores the new sidebar in this array by sidebar ID.
* @uses add_theme_support() to ensure widget support has been added.
*
* @param string|array $args Arguments for the sidebar being registered.
* @return string Sidebar ID added to $wp_registered_sidebars global.
*/
function register_sidebar($args = array()) {
global $wp_registered_sidebars;
$i = count($wp_registered_sidebars) + 1;
$defaults = array(
'name' => sprintf(__('Sidebar %d'), $i ),
'id' => "sidebar-$i",
'description' => '',
'class' => '',
'before_widget' => '<li id="%1$s" class="widget %2$s">',
'after_widget' => "</li>\n",
'before_title' => '<h2 class="widgettitle">',
'after_title' => "</h2>\n",
);
$sidebar = wp_parse_args( $args, $defaults );
$wp_registered_sidebars[$sidebar['id']] = $sidebar;
add_theme_support('widgets');
do_action( 'register_sidebar', $sidebar );
return $sidebar['id'];
}
/**
* Removes a sidebar from the list.
*
* @since 2.2.0
*
* @uses $wp_registered_sidebars Stores the new sidebar in this array by sidebar ID.
*
* @param string $name The ID of the sidebar when it was added.
*/
function unregister_sidebar( $name ) {
global $wp_registered_sidebars;
if ( isset( $wp_registered_sidebars[$name] ) )
unset( $wp_registered_sidebars[$name] );
}
/**
* Register widget for use in sidebars.
*
* The default widget option is 'classname' that can be override.
*
* The function can also be used to unregister widgets when $output_callback
* parameter is an empty string.
*
* @since 2.2.0
*
* @uses $wp_registered_widgets Uses stored registered widgets.
* @uses $wp_register_widget_defaults Retrieves widget defaults.
*
* @param int|string $id Widget ID.
* @param string $name Widget display title.
* @param callback $output_callback Run when widget is called.
* @param array|string $options Optional. Widget Options.
* @param mixed $params,... Widget parameters to add to widget.
* @return null Will return if $output_callback is empty after removing widget.
*/
function wp_register_sidebar_widget($id, $name, $output_callback, $options = array()) {
global $wp_registered_widgets, $wp_registered_widget_controls, $wp_registered_widget_updates, $_wp_deprecated_widgets_callbacks;
$id = strtolower($id);
if ( empty($output_callback) ) {
unset($wp_registered_widgets[$id]);
return;
}
$id_base = _get_widget_id_base($id);
if ( in_array($output_callback, $_wp_deprecated_widgets_callbacks, true) && !is_callable($output_callback) ) {
if ( isset($wp_registered_widget_controls[$id]) )
unset($wp_registered_widget_controls[$id]);
if ( isset($wp_registered_widget_updates[$id_base]) )
unset($wp_registered_widget_updates[$id_base]);
return;
}
$defaults = array('classname' => $output_callback);
$options = wp_parse_args($options, $defaults);
$widget = array(
'name' => $name,
'id' => $id,
'callback' => $output_callback,
'params' => array_slice(func_get_args(), 4)
);
$widget = array_merge($widget, $options);
if ( is_callable($output_callback) && ( !isset($wp_registered_widgets[$id]) || did_action( 'widgets_init' ) ) ) {
do_action( 'wp_register_sidebar_widget', $widget );
$wp_registered_widgets[$id] = $widget;
}
}
/**
* Retrieve description for widget.
*
* When registering widgets, the options can also include 'description' that
* describes the widget for display on the widget administration panel or
* in the theme.
*
* @since 2.5.0
*
* @param int|string $id Widget ID.
* @return string Widget description, if available. Null on failure to retrieve description.
*/
function wp_widget_description( $id ) {
if ( !is_scalar($id) )
return;
global $wp_registered_widgets;
if ( isset($wp_registered_widgets[$id]['description']) )
return esc_html( $wp_registered_widgets[$id]['description'] );
}
/**
* Retrieve description for a sidebar.
*
* When registering sidebars a 'description' parameter can be included that
* describes the sidebar for display on the widget administration panel.
*
* @since 2.9.0
*
* @param int|string $id sidebar ID.
* @return string Sidebar description, if available. Null on failure to retrieve description.
*/
function wp_sidebar_description( $id ) {
if ( !is_scalar($id) )
return;
global $wp_registered_sidebars;
if ( isset($wp_registered_sidebars[$id]['description']) )
return esc_html( $wp_registered_sidebars[$id]['description'] );
}
/**
* Remove widget from sidebar.
*
* @since 2.2.0
*
* @param int|string $id Widget ID.
*/
function wp_unregister_sidebar_widget($id) {
do_action( 'wp_unregister_sidebar_widget', $id );
wp_register_sidebar_widget($id, '', '');
wp_unregister_widget_control($id);
}
/**
* Registers widget control callback for customizing options.
*
* The options contains the 'height', 'width', and 'id_base' keys. The 'height'
* option is never used. The 'width' option is the width of the fully expanded
* control form, but try hard to use the default width. The 'id_base' is for
* multi-widgets (widgets which allow multiple instances such as the text
* widget), an id_base must be provided. The widget id will end up looking like
* {$id_base}-{$unique_number}.
*
* @since 2.2.0
*
* @param int|string $id Sidebar ID.
* @param string $name Sidebar display name.
* @param callback $control_callback Run when sidebar is displayed.
* @param array|string $options Optional. Widget options. See above long description.
* @param mixed $params,... Optional. Additional parameters to add to widget.
*/
function wp_register_widget_control($id, $name, $control_callback, $options = array()) {
global $wp_registered_widget_controls, $wp_registered_widget_updates, $wp_registered_widgets, $_wp_deprecated_widgets_callbacks;
$id = strtolower($id);
$id_base = _get_widget_id_base($id);
if ( empty($control_callback) ) {
unset($wp_registered_widget_controls[$id]);
unset($wp_registered_widget_updates[$id_base]);
return;
}
if ( in_array($control_callback, $_wp_deprecated_widgets_callbacks, true) && !is_callable($control_callback) ) {
if ( isset($wp_registered_widgets[$id]) )
unset($wp_registered_widgets[$id]);
return;
}
if ( isset($wp_registered_widget_controls[$id]) && !did_action( 'widgets_init' ) )
return;
$defaults = array('width' => 250, 'height' => 200 ); // height is never used
$options = wp_parse_args($options, $defaults);
$options['width'] = (int) $options['width'];
$options['height'] = (int) $options['height'];
$widget = array(
'name' => $name,
'id' => $id,
'callback' => $control_callback,
'params' => array_slice(func_get_args(), 4)
);
$widget = array_merge($widget, $options);
$wp_registered_widget_controls[$id] = $widget;
if ( isset($wp_registered_widget_updates[$id_base]) )
return;
if ( isset($widget['params'][0]['number']) )
$widget['params'][0]['number'] = -1;
unset($widget['width'], $widget['height'], $widget['name'], $widget['id']);
$wp_registered_widget_updates[$id_base] = $widget;
}
function _register_widget_update_callback($id_base, $update_callback, $options = array()) {
global $wp_registered_widget_updates;
if ( isset($wp_registered_widget_updates[$id_base]) ) {
if ( empty($update_callback) )
unset($wp_registered_widget_updates[$id_base]);
return;
}
$widget = array(
'callback' => $update_callback,
'params' => array_slice(func_get_args(), 3)
);
$widget = array_merge($widget, $options);
$wp_registered_widget_updates[$id_base] = $widget;
}
function _register_widget_form_callback($id, $name, $form_callback, $options = array()) {
global $wp_registered_widget_controls;
$id = strtolower($id);
if ( empty($form_callback) ) {
unset($wp_registered_widget_controls[$id]);
return;
}
if ( isset($wp_registered_widget_controls[$id]) && !did_action( 'widgets_init' ) )
return;
$defaults = array('width' => 250, 'height' => 200 );
$options = wp_parse_args($options, $defaults);
$options['width'] = (int) $options['width'];
$options['height'] = (int) $options['height'];
$widget = array(
'name' => $name,
'id' => $id,
'callback' => $form_callback,
'params' => array_slice(func_get_args(), 4)
);
$widget = array_merge($widget, $options);
$wp_registered_widget_controls[$id] = $widget;
}
/**
* Remove control callback for widget.
*
* @since 2.2.0
* @uses wp_register_widget_control() Unregisters by using empty callback.
*
* @param int|string $id Widget ID.
*/
function wp_unregister_widget_control($id) {
return wp_register_widget_control($id, '', '');
}
/**
* Display dynamic sidebar.
*
* By default this displays the default sidebar or 'sidebar-1'. If your theme specifies the 'id' or
* 'name' parameter for its registered sidebars you can pass an id or name as the $index parameter.
* Otherwise, you can pass in a numerical index to display the sidebar at that index.
*
* @since 2.2.0
*
* @param int|string $index Optional, default is 1. Index, name or ID of dynamic sidebar.
* @return bool True, if widget sidebar was found and called. False if not found or not called.
*/
function dynamic_sidebar($index = 1) {
global $wp_registered_sidebars, $wp_registered_widgets;
if ( is_int($index) ) {
$index = "sidebar-$index";
} else {
$index = sanitize_title($index);
foreach ( (array) $wp_registered_sidebars as $key => $value ) {
if ( sanitize_title($value['name']) == $index ) {
$index = $key;
break;
}
}
}
$sidebars_widgets = wp_get_sidebars_widgets();
if ( empty( $wp_registered_sidebars[ $index ] ) || empty( $sidebars_widgets[ $index ] ) || ! is_array( $sidebars_widgets[ $index ] ) ) {
return false;
}
$sidebar = $wp_registered_sidebars[$index];
$did_one = false;
foreach ( (array) $sidebars_widgets[$index] as $id ) {
if ( !isset($wp_registered_widgets[$id]) ) continue;
$params = array_merge(
array( array_merge( $sidebar, array('widget_id' => $id, 'widget_name' => $wp_registered_widgets[$id]['name']) ) ),
(array) $wp_registered_widgets[$id]['params']
);
// Substitute HTML id and class attributes into before_widget
$classname_ = '';
foreach ( (array) $wp_registered_widgets[$id]['classname'] as $cn ) {
if ( is_string($cn) )
$classname_ .= '_' . $cn;
elseif ( is_object($cn) )
$classname_ .= '_' . get_class($cn);
}
$classname_ = ltrim($classname_, '_');
$params[0]['before_widget'] = sprintf($params[0]['before_widget'], $id, $classname_);
$params = apply_filters( 'dynamic_sidebar_params', $params );
$callback = $wp_registered_widgets[$id]['callback'];
do_action( 'dynamic_sidebar', $wp_registered_widgets[$id] );
if ( is_callable($callback) ) {
call_user_func_array($callback, $params);
$did_one = true;
}
}
return $did_one;
}
/**
* Whether widget is displayed on the front-end.
*
* Either $callback or $id_base can be used
* $id_base is the first argument when extending WP_Widget class
* Without the optional $widget_id parameter, returns the ID of the first sidebar
* in which the first instance of the widget with the given callback or $id_base is found.
* With the $widget_id parameter, returns the ID of the sidebar where
* the widget with that callback/$id_base AND that ID is found.
*
* NOTE: $widget_id and $id_base are the same for single widgets. To be effective
* this function has to run after widgets have initialized, at action 'init' or later.
*
* @since 2.2.0
*
* @param string $callback Optional, Widget callback to check.
* @param int $widget_id Optional, but needed for checking. Widget ID.
* @param string $id_base Optional, the base ID of a widget created by extending WP_Widget.
* @param bool $skip_inactive Optional, whether to check in 'wp_inactive_widgets'.
* @return mixed false if widget is not active or id of sidebar in which the widget is active.
*/
function is_active_widget($callback = false, $widget_id = false, $id_base = false, $skip_inactive = true) {
global $wp_registered_widgets;
$sidebars_widgets = wp_get_sidebars_widgets();
if ( is_array($sidebars_widgets) ) {
foreach ( $sidebars_widgets as $sidebar => $widgets ) {
if ( $skip_inactive && 'wp_inactive_widgets' == $sidebar )
continue;
if ( is_array($widgets) ) {
foreach ( $widgets as $widget ) {
if ( ( $callback && isset($wp_registered_widgets[$widget]['callback']) && $wp_registered_widgets[$widget]['callback'] == $callback ) || ( $id_base && _get_widget_id_base($widget) == $id_base ) ) {
if ( !$widget_id || $widget_id == $wp_registered_widgets[$widget]['id'] )
return $sidebar;
}
}
}
}
}
return false;
}
/**
* Whether the dynamic sidebar is enabled and used by theme.
*
* @since 2.2.0
*
* @return bool True, if using widgets. False, if not using widgets.
*/
function is_dynamic_sidebar() {
global $wp_registered_widgets, $wp_registered_sidebars;
$sidebars_widgets = get_option('sidebars_widgets');
foreach ( (array) $wp_registered_sidebars as $index => $sidebar ) {
if ( count($sidebars_widgets[$index]) ) {
foreach ( (array) $sidebars_widgets[$index] as $widget )
if ( array_key_exists($widget, $wp_registered_widgets) )
return true;
}
}
return false;
}
/**
* Whether a sidebar is in use.
*
* @since 2.8
*
* @param mixed $index Sidebar name, id or number to check.
* @return bool true if the sidebar is in use, false otherwise.
*/
function is_active_sidebar( $index ) {
$index = ( is_int($index) ) ? "sidebar-$index" : sanitize_title($index);
$sidebars_widgets = wp_get_sidebars_widgets();
$is_active_sidebar = ! empty( $sidebars_widgets[$index] );
return $is_active_sidebar;
}
/* Internal Functions */
/**
* Retrieve full list of sidebars and their widgets.
*
* Will upgrade sidebar widget list, if needed. Will also save updated list, if
* needed.
*
* @since 2.2.0
* @access private
*
* @param bool $deprecated Not used (deprecated).
* @return array Upgraded list of widgets to version 3 array format when called from the admin.
*/
function wp_get_sidebars_widgets($deprecated = true) {
if ( $deprecated !== true )
_deprecated_argument( __FUNCTION__, '2.8.1' );
global $_wp_sidebars_widgets, $sidebars_widgets;
// If loading from front page, consult $_wp_sidebars_widgets rather than options
// to see if wp_convert_widget_settings() has made manipulations in memory.
if ( !is_admin() ) {
if ( empty($_wp_sidebars_widgets) )
$_wp_sidebars_widgets = get_option('sidebars_widgets', array());
$sidebars_widgets = $_wp_sidebars_widgets;
} else {
$sidebars_widgets = get_option('sidebars_widgets', array());
}
if ( is_array( $sidebars_widgets ) && isset($sidebars_widgets['array_version']) )
unset($sidebars_widgets['array_version']);
$sidebars_widgets = apply_filters('sidebars_widgets', $sidebars_widgets);
return $sidebars_widgets;
}
/**
* Set the sidebar widget option to update sidebars.
*
* @since 2.2.0
* @access private
*
* @param array $sidebars_widgets Sidebar widgets and their settings.
*/
function wp_set_sidebars_widgets( $sidebars_widgets ) {
if ( !isset( $sidebars_widgets['array_version'] ) )
$sidebars_widgets['array_version'] = 3;
update_option( 'sidebars_widgets', $sidebars_widgets );
}
/**
* Retrieve default registered sidebars list.
*
* @since 2.2.0
* @access private
*
* @return array
*/
function wp_get_widget_defaults() {
global $wp_registered_sidebars;
$defaults = array();
foreach ( (array) $wp_registered_sidebars as $index => $sidebar )
$defaults[$index] = array();
return $defaults;
}
/**
* Convert the widget settings from single to multi-widget format.
*
* @since 2.8.0
*
* @return array
*/
function wp_convert_widget_settings($base_name, $option_name, $settings) {
// This test may need expanding.
$single = $changed = false;
if ( empty($settings) ) {
$single = true;
} else {
foreach ( array_keys($settings) as $number ) {
if ( 'number' == $number )
continue;
if ( !is_numeric($number) ) {
$single = true;
break;
}
}
}
if ( $single ) {
$settings = array( 2 => $settings );
// If loading from the front page, update sidebar in memory but don't save to options
if ( is_admin() ) {
$sidebars_widgets = get_option('sidebars_widgets');
} else {
if ( empty($GLOBALS['_wp_sidebars_widgets']) )
$GLOBALS['_wp_sidebars_widgets'] = get_option('sidebars_widgets', array());
$sidebars_widgets = &$GLOBALS['_wp_sidebars_widgets'];
}
foreach ( (array) $sidebars_widgets as $index => $sidebar ) {
if ( is_array($sidebar) ) {
foreach ( $sidebar as $i => $name ) {
if ( $base_name == $name ) {
$sidebars_widgets[$index][$i] = "$name-2";
$changed = true;
break 2;
}
}
}
}
if ( is_admin() && $changed )
update_option('sidebars_widgets', $sidebars_widgets);
}
$settings['_multiwidget'] = 1;
if ( is_admin() )
update_option( $option_name, $settings );
return $settings;
}
/**
* Output an arbitrary widget as a template tag
*
* @since 2.8
*
* @param string $widget the widget's PHP class name (see default-widgets.php)
* @param array $instance the widget's instance settings
* @param array $args the widget's sidebar args
* @return void
**/
function the_widget($widget, $instance = array(), $args = array()) {
global $wp_widget_factory;
$widget_obj = $wp_widget_factory->widgets[$widget];
if ( !is_a($widget_obj, 'WP_Widget') )
return;
$before_widget = sprintf('<div class="widget %s">', $widget_obj->widget_options['classname'] );
$default_args = array( 'before_widget' => $before_widget, 'after_widget' => "</div>", 'before_title' => '<h2 class="widgettitle">', 'after_title' => '</h2>' );
$args = wp_parse_args($args, $default_args);
$instance = wp_parse_args($instance);
do_action( 'the_widget', $widget, $instance, $args );
$widget_obj->_set(-1);
$widget_obj->widget($args, $instance);
}
/**
* Private
*/
function _get_widget_id_base($id) {
return preg_replace( '/-[0-9]+$/', '', $id );
}
/**
* Handle sidebars config after theme change
*
* @access private
* @since 3.3.0
*/
function _wp_sidebars_changed() {
global $sidebars_widgets;
if ( ! is_array( $sidebars_widgets ) )
$sidebars_widgets = wp_get_sidebars_widgets();
retrieve_widgets(true);
}
// look for "lost" widgets, this has to run at least on each theme change
function retrieve_widgets($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'];
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) $sidebars_widgets['wp_inactive_widgets']);
wp_set_sidebars_widgets($sidebars_widgets);
return $sidebars_widgets;
}
