WordPress文本小工具详解

<?php
/**
 * Widget API: WP_Widget_Text class
 *
 * @package WordPress
 * @subpackage Widgets
 * @since 4.4.0
 */
 
/**
 * Core class used to implement a Text widget.
 *
 * @since 2.8.0
 *
 * @see WP_Widget
 */
class WP_Widget_Text extends WP_Widget {
 
	/**
	 * Sets up a new Text widget instance.
	 *
	 * @since 2.8.0
	 * @access public
	 */
	public function __construct() {
		$widget_ops = array(
			'classname' => 'widget_text',
			'description' => __( 'Arbitrary text or HTML.' ),
			'customize_selective_refresh' => true,
		);
		$control_ops = array( 'width' => 400, 'height' => 350 );
		parent::__construct( 'text', __( 'Text' ), $widget_ops, $control_ops );
	}
 
	/**
	 * Outputs the content for the current Text 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 Text widget instance.
	 */
	public function widget( $args, $instance ) {
 
		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
		$title = apply_filters( 'widget_title', empty( $instance['title'] ) ? '' : $instance['title'], $instance, $this->id_base );
 
		$widget_text = ! empty( $instance['text'] ) ? $instance['text'] : '';
 
		/**
		 * Filter the content of the Text widget.
		 *
		 * @since 2.3.0
		 * @since 4.4.0 Added the `$this` parameter.
		 *
		 * @param string         $widget_text The widget content.
		 * @param array          $instance    Array of settings for the current widget.
		 * @param WP_Widget_Text $this        Current Text widget instance.
		 */
		$text = apply_filters( 'widget_text', $widget_text, $instance, $this );
 
		echo $args['before_widget'];
		if ( ! empty( $title ) ) {
			echo $args['before_title'] . $title . $args['after_title'];
		} ?>
			<div class="textwidget"><?php echo !empty( $instance['filter'] ) ? wpautop( $text ) : $text; ?></div>
		<?php
		echo $args['after_widget'];
	}
 
	/**
	 * Handles updating settings for the current Text 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 Settings to save or bool false to cancel saving.
	 */
	public function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$instance['title'] = sanitize_text_field( $new_instance['title'] );
		if ( current_user_can( 'unfiltered_html' ) ) {
			$instance['text'] = $new_instance['text'];
		} else {
			$instance['text'] = wp_kses_post( $new_instance['text'] );
		}
		$instance['filter'] = ! empty( $new_instance['filter'] );
		return $instance;
	}
 
	/**
	 * Outputs the Text widget settings form.
	 *
	 * @since 2.8.0
	 * @access public
	 *
	 * @param array $instance Current settings.
	 */
	public function form( $instance ) {
		$instance = wp_parse_args( (array) $instance, array( 'title' => '', 'text' => '' ) );
		$filter = isset( $instance['filter'] ) ? $instance['filter'] : 0;
		$title = sanitize_text_field( $instance['title'] );
		?>
		<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 $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr($title); ?>" /></p>
 
		<p><label for="<?php echo $this->get_field_id( 'text' ); ?>"><?php _e( 'Content:' ); ?></label>
		<textarea class="widefat" rows="16" cols="20" id="<?php echo $this->get_field_id('text'); ?>" name="<?php echo $this->get_field_name('text'); ?>"><?php echo esc_textarea( $instance['text'] ); ?></textarea></p>
 
		<p><input id="<?php echo $this->get_field_id('filter'); ?>" name="<?php echo $this->get_field_name('filter'); ?>" type="checkbox"<?php checked( $filter ); ?> />&nbsp;<label for="<?php echo $this->get_field_id('filter'); ?>"><?php _e('Automatically add paragraphs'); ?></label></p>
		<?php
	}
}

//自定义WordPress文本小工具的标题
function wptoutiao_widget_title( $title ) {
	$title = '<strong>'.$title.'</strong>';
	return $title;
}
add_filter( 'widget_title', 'wptoutiao_widget_title' );

//自定义WordPress文本小工具的内容
function wptoutiao_widget_text($html){
      if(strpos($html,"<"."?php")!==false){
          ob_start();
          eval("?".">".$html);
          $html=ob_get_contents();
          ob_end_clean();
      }
      return $html;
  }
  add_filter( 'widget_text' , 'wptoutiao_widget_text' );