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<?php

class WP_Widget_Calendar extends WP_Widget
{
    private static $instance = 0;
    public function __construct()
    {
        $widget_ops = array('classname' => 'widget_calendar', 'description' => __('A calendar of your site’s posts.'), 'customize_selective_refresh' => true);
        parent::__construct('calendar', __('Calendar'), $widget_ops);
    }
    public function widget($args, $instance)
    {
        $title = !empty($instance['title']) ? $instance['title'] : '';
        $title = apply_filters('widget_title', $title, $instance, $this->id_base);
        echo $args['before_widget'];
        if ($title) {
            echo $args['before_title'] . $title . $args['after_title'];
        }
        if (0 === self::$instance) {
            echo '<div id="calendar_wrap" class="calendar_wrap">';
        } else {
            echo '<div class="calendar_wrap">';
        }
        get_calendar();
        echo '</div>';
        echo $args['after_widget'];
        self::$instance++;
    }
    public function update($new_instance, $old_instance)
    {
        $instance = $old_instance;
        $instance['title'] = sanitize_text_field($new_instance['title']);
        return $instance;
    }
    public function form($instance)
    {
        $instance = wp_parse_args((array) $instance, array('title' => ''));
        ?>
		<p>
			<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 $this->get_field_name('title');
        ?>" type="text" value="<?php 
        echo esc_attr($instance['title']);
        ?>" />
		</p>
		<?php 
    }
}