WP插件我收到通知：未定义的索引：创建小部件时出错"instance"未定义

Question

正在更新一个旧但我最喜欢的不支持插件之一。我已经使所有功能当前功能和插件在define('WP_DEBUG', true);中运行时可以修复几个错误，因此此插件尝试加载默认值，但是我会遇到错误创建新的窗口小部件天气，或者没有默认的AD。我一直在寻找一种更好的方法来无运气。问题是$instance['name']保持不确定，直到保存小部件为止。感谢您的帮助，谢谢

错误我得到这个实例

注意：未定义的索引：in/var/www/public_html/wp-content/plugins/advertising-manager/lib/advman/widgen/widget.php on 56

我为每个结果得到这个

注意：未定义的索引：in/var/www/public_html/wp-content/plugins/advertising-manager/lib/advman/widget.php on 58

这是代码小部件php

    <?php
class Advman_Widget extends WP_Widget
{
    function Advman_Widget()
    {
        $widget_ops = array('classname' => 'Advman_Widget', 'description' => __('Place an ad', 'advman'));
        parent::__construct('advman', __('Advertisement', 'advman'), $widget_ops);
    }
    function widget($args, $instance)
    {
        extract($args); //nb. $name comes out of this, hence the use of $n
        global $advman_engine;
        $n = $instance['name'] == '' ? $advman_engine->getSetting('default-ad') : $instance['name'];
        $ad = $advman_engine->selectAd($n);
        if (!empty($ad)) {
            $suppress = !empty($instance['suppress']);
            $title = apply_filters('widget_title', $instance['title']);
            $ad_code = $ad->display();
            echo $suppress ? ($title . $ad_code) : ($before_widget . $before_title . $title . $after_title . $ad_code . $after_widget);
            $advman_engine->incrementStats($ad);
        }
    }
    function update($new_instance, $old_instance)
    {
        $instance = $old_instance;
        $instance['title'] = strip_tags(stripslashes($new_instance['title']));
        $instance['suppress'] = !empty($new_instance['suppress']);
        $instance['name'] = $new_instance['name'];
        return $instance;
    }
    function form($instance)
    {
        global $advman_engine;
        $ads = $advman_engine->getAds();
        $names = array();
        // Loop through ads, and get only unique ad names
        foreach ($ads as $ad) {
            $names[$ad->name] = $ad->name;
        }
    $title = isset( $instance['title'] ) ? esc_attr( $instance['title'] ) : '';
    $checked = !empty($instance['suppress']) ? 'checked="checked"' : '';
?>
            <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:', 'advman'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></label></p>
            <p>
                <label for="<?php echo $this->get_field_id('name'); ?>"><?php _e('Select an ad to display:', 'advman'); ?>
                <select class="widefat" id="<?php echo $this->get_field_id('name'); ?>" name="<?php echo $this->get_field_name('name'); ?>">
                    <option value=""<?php echo $instance['name'] == "" ? " selected='selected'" : ''; ?>><?php _e('Default Ad', 'advman'); ?></option>
<?php foreach ($names as $name) : ''?>
                    <option value="<?php echo $name; ?>"<?php echo $name == $instance['name'] ? " selected='selected'" : ''; ?>>#<?php echo $name; ?></option>
<?php endforeach; ?>
                </select>
                </label>
            </p>
            <p><label for="<?php echo $this->get_field_id('suppress'); ?>"><?php _e('Hide widget formatting', 'advman'); ?> <input class="checkbox" id="<?php echo $this->get_field_id('suppress'); ?>" name="<?php echo $this->get_field_name('suppress'); ?>" type="checkbox" <?php echo $checked; ?> /></label></p>
        <?php
    }
}
?>

Answer 1

我发现我的问题有时会有助于做其他事情

我在分配中使用isset（），然后才能进行任何选择

我的修复

// I Added 
if(!isset($instance['name']) || empty($instance['name'])) { 
$instance['name'] = ""; 


//Added it here
$title = isset( $instance['title'] ) ? esc_attr( $instance['title'] ) : '';
if(!isset($instance['name']) || empty($instance['name'])) { 
$instance['name'] = ""; 
}   
$checked = !empty($instance['suppress']) ? 'checked="checked"' : '';