我是WordPress的新手。我创建了第一个丑陋的小部件。它位于wp-content/plugins/my-awesome-widget/widget_init.php （此文件夹中没有其他文件）。它正在发挥作用。我创建了一个侧栏并在中注册了它functions.php 在我的主题文件夹中：
function register_page_widgets()
{
if (function_exists(\'register_sidebar\')) {
register_sidebar(
array(
\'name\' => \'Page sidebar\',
\'id\' => \'page_sidebar\',
\'description\' => \'\',
\'class\' => \'\',
\'before_widget\' => \'<div class="page-sidebar">\',
\'before_title\' => \'<div class="title"><span>\',
\'after_title\' => \'</span></div>\',
\'after_widget\' => \'</div>\'
)
);
}
}
add_action( \'widgets_init\', \'register_page_widgets\' );
除了我的小部件之外，我在数组中定义的所有小部件（位于此侧边栏中，包装在元素中）：
在\\u小部件之前、在\\u标题之前等。在我的代码中（在widget_init.php) 我写道：print_r($args);
结果是：Array
(
[name] => Page sidebar
[id] => page_sidebar
[description] =>
[class] =>
[before_widget] =>
[after_widget] =>
[before_title] =>
[after_title] =>
[widget_id] => my_first_widget
[widget_name] => My First Widget
)
不知何故，在\\u小部件之前、在\\u小部件之后、在\\u标题之前和在\\u标题之后都是空的。怎么了？我的代码：
<?php
/*
Plugin Name: My Own Recent Posts
Plugin URI: http://www.example.com/textwidget
Description: An example plugin to demonstrate widgets API in WordPress
Version: 0.1
Author: Author Name
Author URI: http://www.example.com
License: GPL2
*/
add_action( \'widgets_init\', function(){
register_widget( \'My_Own_Recent_Posts\' );
});
class My_Own_Recent_Posts extends WP_Widget {
public function __construct() {
parent::__construct(
\'My_Own_Recent_Posts\',
\'My First Widget\',
array( \'description\' => __( \'My First Widget\', \'text_domain\' ), )
);
}
public function update( $new_instance, $old_instance ) {
$instance = array();
$instance[\'title\'] = sanitize_text_field( $new_instance[\'title\'] );
$instance[\'count_of_posts\'] = sanitize_text_field( $new_instance[\'count_of_posts\'] );
$instance[\'words_to_display\'] = sanitize_text_field( $new_instance[\'words_to_display\'] );
$instance[\'post_types\'] = $new_instance[\'post_types\'];
return $instance;
}
public function form( $instance ) { ?>
<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 $instance[\'title\']; ?>" />
</p>
<p><label for="<?php echo $this->get_field_id( \'count_of_posts\' ); ?>"><?php _e( \'Count of posts:\' ); ?></label>
<input class="widefat"
id="<?php echo $this->get_field_id( \'count_of_posts\' ); ?>"
name="<?php echo $this->get_field_name( \'count_of_posts\' ); ?>"
type="number"
max="50"
min="1"
value="<?php echo $instance[\'count_of_posts\']; ?>" />
</p>
<p><label for="<?php echo $this->get_field_id( \'words_to_display\' ); ?>"><?php _e( \'Words from post to display:\' ); ?></label>
<input class="widefat"
id="<?php echo $this->get_field_id( \'words_to_display\' ); ?>"
name="<?php echo $this->get_field_name( \'words_to_display\' ); ?>"
type="number"
max="50"
min="1"
value="<?php echo $instance[\'words_to_display\']; ?>" />
</p>
<p><label for="<?php echo $this->get_field_id( \'post_types\' ); ?>"><?php _e( \'Select post types:\' ); ?><br></label>
<?php
$args = array(\'_builtin\' => \'\', \'public\' => true);
$post_types = get_post_types($args, \'object\');
foreach($post_types as $post_type) : ?>
<?php
$checked=\'\';
if(@in_array($post_type->name, $instance[\'post_types\'])) $checked=\'checked\';
?>
<input type="checkbox"
value="<?=$post_type->name?>"
name="<?php echo $this->get_field_name( \'post_types\' ).\'[]\'; ?>"
id="<?php echo $this->get_field_id(\'post_types\'); ?>"
<?=$checked?>><?=$post_type->labels->name?><br>
<? endforeach;
}
public function widget( $args, $instance ) {
echo \'<div class="page-sidebar"><div class="title"><span>\'.$instance[\'title\'].\'</span></div>\';
function limit_words($string, $word_limit) {
$words=explode(" ",$string);
return implode(" ",array_splice($words,0,$word_limit));
}
function link_words($limited_string){
$words = explode(\' \', $limited_string);
array_splice($words, 5, 0, "</a>");
return implode(\' \', $words);
}
if(!empty($instance)) :
global $post;
$posts = get_posts(
array(
\'numberposts\' => $instance[\'count_of_posts\'],
\'offset\' => 0,
\'category\' => \'\',
\'orderby\' => \'post_date\',
\'order\' => \'DESC\',
\'include\' => \'\',
\'exclude\' => \'\',
\'meta_key\' => \'\',
\'meta_value\' => \'\',
\'post_type\' => $instance[\'post_types\'],
\'post_mime_type\' => \'\',
\'post_parent\' => \'\',
\'post_status\' => \'publish\'
)
);
$shows=0;
foreach($posts as $post){ setup_postdata($post);?>
<a href="<?php the_permalink() ?>">
<?php echo link_words(limit_words(get_field(\'content\'), $instance[\'words_to_display\']))."...";
if($shows != ($instance[\'count_of_posts\']-1)) echo \'<hr>\';
$shows++;
}
wp_reset_postdata();
endif;
echo "</div>";
}
}
