一个新开发的主题没有侧边栏，需要在自己注册侧边栏，在functions.php中添加代码
//注册侧边栏
if ( function_exists('register_sidebar') ) {
register_sidebar(array(
'name'=>'首页边栏',
'id'=>'sidebar1',
'before_widget' => '<li id="%1$s" class="sidebar_li %2$s">',
'after_widget' => '</li>',
'before_title' => '<h3>',
'after_title' => '</h3>',
));
register_sidebar(array(
'name'=>'侧边栏',
'id'=>'sidebar3',
'before_widget' => '<li id="%1$s" class="sidebar_li %2$s">',
'after_widget' => '</li>',
'before_title' => '<h3>',
'after_title' => '</h3>',
));
register_sidebar(array(
'name'=>'脚部边栏',
'id'=>'sidebar2',
'before_widget' => '<li id="%1$s" class="sidebar_li %2$s">',
'after_widget' => '</li>',
'before_title' => '<h3>',
'after_title' => '</h3>',
));
}
这里注册三个侧边栏，随后在小工具中可以看到三个侧边栏
接下来就是要在目录页或者文章页调用侧边栏了代码如下：
<ul id="sidebar">
<?php if ( ! dynamic_sidebar("<span style="font-family: Arial, Helvetica, sans-serif;">sidebar3</span><span style="font-family: Arial, Helvetica, sans-serif;">") ) : ?></span>
<li>没有就显示默认的</li>
<li><span style="font-family: Arial, Helvetica, sans-serif;">没有就显示默认的</span><span style="font-family: Arial, Helvetica, sans-serif;"></li></span>
<?php endif; ?>
</ul>
左边小工具的开发，下边是WordPress默认的近期文章
</pre><p></p><pre name="code" class="php"></pre><pre name="code" class="php"><?php
/**
* Recent_Posts widget class
*
* @since 2.8.0
*/
class WP_Widget_Recent_Posts extends WP_Widget {
/**
* classname指你自己的class
* description 是你自己的描述
* parent::__construct('你的id唯一','你的小工具的名字', $widget_ops);
* */
public function __construct() {
$widget_ops = array('classname' => 'widget_recent_entries', 'description' => __( "Your site’s most recent Posts.") );
parent::__construct('recent-posts', __('Recent Posts'), $widget_ops);
//下面的不需要一般不用写
$this->alt_option_name = 'widget_recent_entries';
add_action( 'save_post', array($this, 'flush_widget_cache') );
add_action( 'deleted_post', array($this, 'flush_widget_cache') );
add_action( 'switch_theme', array($this, 'flush_widget_cache') );
}
/**
* 前台展示的方法
* */
public function widget($args, $instance) {
$cache = array();
if ( ! $this->is_preview() ) {
$cache = wp_cache_get( 'widget_recent_posts', 'widget' );
}
if ( ! is_array( $cache ) ) {
$cache = array();
}
if ( ! isset( $args['widget_id'] ) ) {
$args['widget_id'] = $this->id;
}
if ( isset( $cache[ $args['widget_id'] ] ) ) {
echo $cache[ $args['widget_id'] ];
return;
}
ob_start();
$title = ( ! empty( $instance['title'] ) ) ? $instance['title'] : __( 'Recent Posts' );
/** This filter is documented in wp-includes/default-widgets.php */
$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
$number = ( ! empty( $instance['number'] ) ) ? absint( $instance['number'] ) : 5;
if ( ! $number )
$number = 5;
$show_date = isset( $instance['show_date'] ) ? $instance['show_date'] : false;
/**
* Filter the arguments for the Recent Posts widget.
*
* @since 3.4.0
*
* @see WP_Query::get_posts()
*
* @param array $args An array of arguments used to retrieve the recent posts.
*/
$r = new WP_Query( apply_filters( 'widget_posts_args', array(
'posts_per_page' => $number,
'no_found_rows' => true,
'post_status' => 'publish',
'ignore_sticky_posts' => true
) ) );
if ($r->have_posts()) :
?>
<?php echo $args['before_widget']; ?>
<?php if ( $title ) {
echo $args['before_title'] . $title . $args['after_title'];
} ?>
<ul>
<?php while ( $r->have_posts() ) : $r->the_post(); ?>
<li>
<a href="<?php the_permalink(); ?>"><?php get_the_title() ? the_title() : the_ID(); ?></a>
<?php if ( $show_date ) : ?>
<span class="post-date"><?php echo get_the_date(); ?></span>
<?php endif; ?>
</li>
<?php endwhile; ?>
</ul>
<?php echo $args['after_widget']; ?>
<?php
// Reset the global $the_post as this query will have stomped on it
wp_reset_postdata();
endif;
if ( ! $this->is_preview() ) {
$cache[ $args['widget_id'] ] = ob_get_flush();
wp_cache_set( 'widget_recent_posts', $cache, 'widget' );
} else {
ob_end_flush();
}
}
/**
* 更新一般直接是将数据处理一下直接返回
* */
public function update( $new_instance, $old_instance ) {
$instance = $old_instance;
$instance['title'] = strip_tags($new_instance['title']);
$instance['number'] = (int) $new_instance['number'];
$instance['show_date'] = isset( $new_instance['show_date'] ) ? (bool) $new_instance['show_date'] : false;
$this->flush_widget_cache();
$alloptions = wp_cache_get( 'alloptions', 'options' );
if ( isset($alloptions['widget_recent_entries']) )
delete_option('widget_recent_entries');
return $instance;
}
public function flush_widget_cache() {
wp_cache_delete('widget_recent_posts', 'widget');
}
/**
* 后台展示方法
* */
public function form( $instance ) {
$title = isset( $instance['title'] ) ? esc_attr( $instance['title'] ) : '';
$number = isset( $instance['number'] ) ? absint( $instance['number'] ) : 5;
$show_date = isset( $instance['show_date'] ) ? (bool) $instance['show_date'] : false;
?>
<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 $title; ?>" /></p>
<p><label for="<?php echo $this->get_field_id( 'number' ); ?>"><?php _e( 'Number of posts to show:' ); ?></label>
<input id="<?php echo $this->get_field_id( 'number' ); ?>" name="<?php echo $this->get_field_name( 'number' ); ?>" type="text" value="<?php echo $number; ?>" size="3" /></p>
<p><input class="checkbox" type="checkbox" <?php checked( $show_date ); ?> id="<?php echo $this->get_field_id( 'show_date' ); ?>" name="<?php echo $this->get_field_name( 'show_date' ); ?>" />
<label for="<?php echo $this->get_field_id( 'show_date' ); ?>"><?php _e( 'Display post date?' ); ?></label></p>
<?php
}
}
register_widget('IntroduceViews');
?>
include_once (TEMPLATEPATH.'/LastPost.php');
这样刷新后台小工具，就可以看到你自己写的小工具了。