WordPress HTTP API を探索する: wp_remote_get の実例

public function display_twitter_information( $content ) {

	// If we're on a single post or page...
	if ( is_single() ) {

		// ...attempt to make a response to twitter. Note that you should replace your username here!
		if ( null == ( $json_response = $this->make_twitter_request( 'wptuts' ) ) ) {

			// ...display a message that the request failed
			$html = '
<div id="twitter-demo-content">';
 $html .= 'There was a problem communicating with the Twitter API..';
 $html .= '</div>
<!-- /#twitter-demo-content -->';

		// ...otherwise, read the information provided by Twitter
		} else {

			$html = '
<div id="twitter-demo-content">';
 $html .= 'I have ' . $this->get_follower_count( $json_response ) . ' followers and my last tweet was "' . $this->get_last_tweet( $json_response ) . '".';
 $html .= '</div>
<!-- /#twitter-demo-content -->';

		} // end if/else

		$content .= $html;

	} // end if/else

	return $content;

}

private function get_follower_count( $json ) {
	return ( -1 < $json->followers_count ) ? $json->followers_count : -1;
} // end get_follower_count

private function get_last_tweet( $json ) {
	return ( 0 < strlen( $json->status->text ) ) ? $json->status->text : '[ No tweet found. ]';
} // end get_last_tweet

<?php
/**
 * Plugin Name: Twitter Demo
 * Plugin URI:  http://example.com/twitter-demo/
 * Description: Retrieves the number of followers and latest Tweet from your Twitter account.
 * Version:     1.0.0
 * Author:      Tom McFarlin
 * Author URI:  http://tommcfarlin.com/
 * License:     GPL-2.0+
 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
 */
class Twitter_Demo {
	/**
	 * Instance of this class.
	 *
	 * @var      Twitter_Demo
	 */
	private static $instance;

	/**
	 * Initializes the plugin so that the Twitter information is appended to the end of a single post.
	 * Note that this constructor relies on the Singleton Pattern
	 *
	 * @access private
	 */
	private function __construct() {
		add_action( 'the_content', array( $this, 'display_twitter_information' ) );
	} // end constructor

	/**
	 * Creates an instance of this class
	 *
	 * @access public
	 * @return Twitter_Demo    An instance of this class
	 */
	public function get_instance() {
		if ( null == self::$instance ) {
			self::$instance = new self;
		}
		return self::$instance;
	} // end get_instance

	/**
	 * Appends a message to the bottom of a single post including the number of followers and the last Tweet.
	 *
	 * @access public
	 * @param  $content    The post content
	 * @return $content    The post content with the Twitter information appended to it.
	 */
	public function display_twitter_information( $content ) {
		// If we're on a single post or page...
		if ( is_single() ) {
			// ...attempt to make a response to twitter. Note that you should replace your username here!
			if ( null == ( $json_response = $this--->make_twitter_request('wptuts') ) ) {

				// ...display a message that the request failed
				$html = '
<div id="twitter-demo-content">';
 $html .= 'There was a problem communicating with the Twitter API..';
 $html .= '</div>
<!-- /#twitter-demo-content -->';

				// ...otherwise, read the information provided by Twitter
			} else {

				$html = '
<div id="twitter-demo-content">';
 $html .= 'I have ' . $this->get_follower_count( $json_response ) . ' followers and my last tweet was "' . $this->get_last_tweet( $json_response ) . '".';
 $html .= '</div>
<!-- /#twitter-demo-content -->';

			} // end if/else

			$content .= $html;

		} // end if/else

		return $content;

	} // end display_twitter_information

	/**
	 * Attempts to request the specified user's JSON feed from Twitter
	 *
	 * @access public
	 * @param  $username   The username for the JSON feed we're attempting to retrieve
	 * @return $json       The user's JSON feed or null of the request failed
	 */
	private function make_twitter_request( $username ) {

		$response = wp_remote_get( 'https://twitter.com/users/' . $username . '.json' );
		try {

			// Note that we decode the body's response since it's the actual JSON feed
			$json = json_decode( $response['body'] );

		} catch ( Exception $ex ) {
			$json = null;
		} // end try/catch

		return $json;

	} // end make_twitter_request

	/**
	 * Retrieves the number of followers from the JSON feed
	 *
	 * @access private
	 * @param  $json     The user's JSON feed
	 * @return           The number of followers for the user. -1 if the JSON data isn't properly set.
	 */
	private function get_follower_count( $json ) {
		return ( -1 < $json->followers_count ) ? $json->followers_count : -1;
	} // end get_follower_count

	/**
	 * Retrieves the last tweet from the user's JSON feed
	 *
	 * @access private
	 * @param  $json     The user's JSON feed
	 * @return           The last tweet from the user's feed. '[ No tweet found. ]' if the data isn't properly set.
	 */
	private function get_last_tweet( $json ) {
		return ( 0 < strlen( $json->status->text ) ) ? $json->status->text : '[ No tweet found. ]';
	} // end get_last_tweet

} // end class

// Trigger the plugin
Twitter_Demo::get_instance();