如何为我的主题创建新的wordpress小部件

<?php 
/* 
Plugin Name: Widget 
Description: Widget Description 
*/ 

// Creating the widget 
// Create a class named as "sample_widget" that is a child class of "WP_Widget". 
class sample_widget extends WP_Widget 
{ 
    //Constructor of class 
    public function __construct() 
    { 
     parent::__construct(
     // Id of our widget. 
      'sample_widget', 
     // This is the widget name that will be visible to user 
      __('Sample Widget'), 
     // Description of our widget 
      array(
      'description' => __('Description of our widget.') 
     )); 
    } 

    // Creating widget front-end 
    // This is where the action happens 
    // Creating function named as "widget", receiving two parameters. 
    public function widget($args, $instance) 
    { 
     /*Getting and assigning our widget title to wordpress hook "widget_title" 
     and passing its value to "$title" */ 
     $title = apply_filters('widget_title', $instance['title']); 
     // Area, that is before the widget is diplayed 
     echo $args['before_widget']; 
     // Checking "$title" is empty or not 
     if (!empty($title)) /* If "$title" is not empty, below code will execute. 
     $args['before_title'] -> Displaying content before our widget title 
     $title -> Display our widget title 
     $args['after_title'] -> Displaying content after our widget title */ { 
      echo $args['before_title'] . $title . $args['after_title']; 
     } 

     // Displaying text of our widget 
     echo __('Hello, this is our widget text!'); 
     // Displaying content after our widget 
     echo $args['after_widget']; 
    } 

    // This function naming our widget title 
    public function form($instance) 
    { 
     // If title is already set. 
     if (isset($instance['title'])) { 
      // $title is getting already assigned title 
      $title = $instance['title']; 
     } 
     // Otherwise our default title will be "Widget title" 
     else { 
      $title = __('Widget title'); 
     } 

?> 
<!-- These are the settings and user interface that an admin will see --> 
<p> 
<!-- Already set title will be displayed at the top of our widget in admin panel --> 
<label for="<?php 
     echo $this->get_field_id('title'); 
?>"><?php 
     _e('Title:'); 
?></label> 
<input class="widefat" id="<?php 
     echo $this->get_field_id('title'); 
?>" name="<?php 
     echo $this->get_field_name('title'); 
?>" type="text" value="<?php 
     echo esc_attr($title); 
?>" /> 
</p> 
<?php 
    } 

    // This function will replace old title with new title of our widget 
    public function update($new_instance, $old_instance) 
    { 
     $instance   = array(); 
     $instance['title'] = (!empty($new_instance['title'])) ? strip_tags($new_instance['title']) : ''; 
     return $instance; 
    } 
} 

// Function to register and load our newly widget 
function sample_widget_load() 
{ 
    // Registering our widget named as "sample_widget" 
    register_widget('sample_widget'); 
} 
// Calling our newly created function named as "sample_widget_load" to register our widget 
add_action('widgets_init', 'sample_widget_load'); 

?>

来源

2016-01-29 12:30:23

如何为我的主题创建新的wordpress小部件

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