WordPress update not saving

我无法在编辑表单中获取保存和检索的数据，以下代码有什么问题：

<?php 

namespace App\\Widgets;

class TextWidget extends \\WP_Widget
{
    public function __construct()
    {
        $widgetOpts = array(
            \'classname\' => \'widget_text\',
            \'description\' => __(\'Um texto puro qualquer.\'),
            \'customize_selective_refresh\' => true,
        );

        parent::__construct(\'custom_text\', __(\'Texto puro\'), $widgetOpts);
    }

    public static function init()
    {
        add_action(\'widgets_init\', function() {
            register_widget(self::class);
        });
    }

    public function widget($args, $instance)
    {
        echo esc_html__($instance[\'content\'], \'text_domain\');
    }

    public function form($instance)
    {
        $instance = wp_parse_args(
            (array) $instance,
            [\'content\' => \'\']
        );
        ?>
        <p>
            <textarea 
                class="widefat" 
                id="<?php echo esc_attr($this->get_field_id(\'content\')); ?>" 
                name="<?php echo esc_attr($this->get_field_name(\'content\')); ?>" 
                type="text" 
                cols="30" 
                rows="10"
            ><?php echo esc_attr($instance[\'content\']); ?></textarea>
        </p>
        <?php
    }

    public function update($newInstance, $oldInstance)
    {
        $instance = array();

        $instance[\'content\'] = (!empty( $newInstance[\'content\'])) ? $oldInstance[\'content\'] : \'\';

        return $instance;
    }
}

/** * Sanitize widget form values as they are saved. * * @see WP_Widget::update() * * @param array $new_instance Values just sent to be saved. * @param array $old_instance Previously saved values from database. * * @return array Updated safe values to be saved. */ public function update( $new_instance, $old_instance ) { $instance = array(); $instance[\'title\'] = ( ! empty( $new_instance[\'title\'] ) ) ? strip_tags( $new_instance[\'title\'] ) : \'\'; return $instance; }

Using add_filter() in Widgets

只需查询引用add_filter() 作用您可以在WordPress小部件类中使用此函数吗。Example我有一个带有动态创建代码的小部件，我想将其传递给插件中创建的另一个函数。这能实现吗？<?php /** * Display the actual Widget * * @param Array $args * @param Array $instance */ public function widget($args, $inst

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