我们可以通过RSS来订阅别人的网站内容,例如WordPress头条的Feed地址是http://www.wptoutiao.com/feed,WordPress提供了一个RSS小工具,可以在侧边栏展示网站的Feed内容。今天就来详细介绍一下WordPress RSS小工具。
WordPress RSS小工具使用介绍
在网站【后台-外观-小工具】中找到RSS小工具,将它拖到想要展示的侧边栏中。
设置选项:
1.RSS Feed地址(例:http://www.wptoutiao.com/feed)
2.Feed的标题设置
3.Feed内容数量
4.是否显示条目内容
5.是否显示条目作者
6.是否显示条目日期
设置完成保存就可以了。
WordPress RSS小工具源码介绍
源码位置:wp-includes\widgets\class-wp-widget-rss.php
源代码:(since 4.4.0)
__( 'Entries from any RSS or Atom feed.' ),
'customize_selective_refresh' => true,
);
$control_ops = array( 'width' => 400, 'height' => 200 );
parent::__construct( 'rss', __( 'RSS' ), $widget_ops, $control_ops );
}
/**
* Outputs the content for the current RSS widget instance.
*
* @since 2.8.0
* @access public
*
* @param array $args Display arguments including 'before_title', 'after_title',
* 'before_widget', and 'after_widget'.
* @param array $instance Settings for the current RSS widget instance.
*/
public function widget( $args, $instance ) {
if ( isset($instance['error']) && $instance['error'] )
return;
$url = ! empty( $instance['url'] ) ? $instance['url'] : '';
while ( stristr($url, 'http') != $url )
$url = substr($url, 1);
if ( empty($url) )
return;
// self-url destruction sequence
if ( in_array( untrailingslashit( $url ), array( site_url(), home_url() ) ) )
return;
$rss = fetch_feed($url);
$title = $instance['title'];
$desc = '';
$link = '';
if ( ! is_wp_error($rss) ) {
$desc = esc_attr(strip_tags(@html_entity_decode($rss->get_description(), ENT_QUOTES, get_option('blog_charset'))));
if ( empty($title) )
$title = strip_tags( $rss->get_title() );
$link = strip_tags( $rss->get_permalink() );
while ( stristr($link, 'http') != $link )
$link = substr($link, 1);
}
if ( empty($title) )
$title = empty($desc) ? __('Unknown Feed') : $desc;
/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
$url = strip_tags( $url );
$icon = includes_url( 'images/rss.png' );
if ( $title )
$title = '
'. esc_html( $title ) . '';
echo $args['before_widget'];
if ( $title ) {
echo $args['before_title'] . $title . $args['after_title'];
}
wp_widget_rss_output( $rss, $instance );
echo $args['after_widget'];
if ( ! is_wp_error($rss) )
$rss->__destruct();
unset($rss);
}
/**
* Handles updating settings for the current RSS widget instance.
*
* @since 2.8.0
* @access public
*
* @param array $new_instance New settings for this instance as input by the user via
* WP_Widget::form().
* @param array $old_instance Old settings for this instance.
* @return array Updated settings to save.
*/
public function update( $new_instance, $old_instance ) {
$testurl = ( isset( $new_instance['url'] ) && ( !isset( $old_instance['url'] ) || ( $new_instance['url'] != $old_instance['url'] ) ) );
return wp_widget_rss_process( $new_instance, $testurl );
}
/**
* Outputs the settings form for the RSS widget.
*
* @since 2.8.0
* @access public
*
* @param array $instance Current settings.
*/
public function form( $instance ) {
if ( empty( $instance ) ) {
$instance = array( 'title' => '', 'url' => '', 'items' => 10, 'error' => false, 'show_summary' => 0, 'show_author' => 0, 'show_date' => 0 );
}
$instance['number'] = $this->number;
wp_widget_rss_form( $instance );
}
}
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工具虽小,功能无穷啊!