PHP Class for parsing XML from the Reuters API

Reuters.php

<?php
/**
 * Parse Investor XML Feeds
 *
 * XML feeds pulled in from Reuters, parsed,
 * cached and displayed on homepage.
 *
 * @param int $compid The account identifier for access to the XML API
 * @param bool $debug Sets a debug mode for faster testing
 */
if ( !class_exists( 'Reuters' ) ):

class Reuters {

	static $compid = XXXXXX;
	static $debug = false;

	/**
	 * HTTP Request to API
	 *
	 * @param string $feed The URL for a given Reuters XML feed
	 */
	static function http_request( $feed = null ) {

		// Validate feed
		if ( ! $feed )
			return new WP_Error( 'ReutersFeeds_error', __( 'No feed provided.' ) );

		// HTTP request
		//
		// Note: Reuters does not send proper error
		// response codes with their XML
		$response = wp_remote_get( $feed, array(
			'compress' => false
		) );
		$body = wp_remote_retrieve_body( $response );

		// Convert XML to JSON
		$xml = new SimpleXMLElement( $body, LIBXML_NOCDATA );
		$json = json_encode( $xml );
		$obj = json_decode( $json );

		// Error handling
		if ( isset($obj->Errors) )
			return new WP_Error( 'xml_api_error', __( $obj->Errors->Error ), $feed );

		return $obj;
	}


	/**
	 * Fetch an HTTP response
	 *
	 * @param string $type Determine the type of output this is, currently this can be 'events' or 'news'
	 * @param int $size How many items to return
	 */
	static function generate_output( $type = null, $size = 4 ) {

		// Output for NEWS type
		if ( $type == 'news' ) {

			// Make HTTP request
			$response = self::http_request( 'http://xml.corporate-ir.net/irxmlclient.asp?compid=' . self::$compid . '&reqtype=newsreleases_2' );
			if ( is_wp_error($response) )
				return $response->get_error_message();

			$entries = $response->NewsReleases->NewsRelease;
		}

		// Output for EVENTS type
		elseif ( $type == 'events' ) {

			// Make HTTP request
			$response = self::http_request( 'http://xml.corporate-ir.net/irxmlclient.asp?compid=' . self::$compid . '&reqtype=events2' );
			if ( is_wp_error($response) )
				return $response->get_error_message();

			$entries = $response->Events->Event;
			$entries = array_reverse( $entries );
		}

		// No type available
		else {
			return new WP_Error( 'ReutersFeeds_error', __( 'Non-existent or invalid $type provided.' ) );
		}

		// Validate
		if ( !$entries )
			return new WP_Error( 'ReutersFeeds_error', __( 'Non-existent or invalid $entries provided.' ) );

		// Format output
		$i = 0;
		$output = '';
		foreach ( $entries as $entry ) {
			$i++;

			// Format entry
			$entry_func = "{$type}_entry";
			$output .= self::$entry_func( $entry );

			// Limit feed size
			if ( $i >= $size )
				break;
		}

		// Output
		return $output;
	}


	/**
	 * News display
	 *
	 * @param string $type Determine the type of output this is, currently this can be 'events' or 'news'
	 */
	static function display( $type = null ) {

		// Check required
		if ( ! $type )
			return false;

		// Generate cache if it doesn't exist
		$label = __CLASS__ . "_{$type}_output";
		if ( false === ( $output = get_transient( $label ) ) || self::$debug ) {
			$output = Reuters::generate_output( $type, 2 );
			set_transient( $label, $output, HOUR_IN_SECONDS );
		}

		// No content
		if ( empty($output) || is_wp_error( $output ) )
			$output = "<article><p>There are currently no upcoming $type scheduled.</p></article>";

		if ( !is_wp_error( $output ) )
			echo $output;
	}


	/**
	 * Format news entry
	 *
	 * @param array $entry Data for a given entry
	 */
	static function news_entry( $entry = null ) {

		if ( !$entry )
			return;

		// Data
		$entry = (array) $entry;
		$date = explode( ' ', $entry['Date'] );
		$date = str_replace( '/', '.', $date[0] );
		$title = apply_filters( 'the_title', $entry['Title'] );
		$id = $entry['@attributes']->ReleaseID;
		$link = "http://investors.keryx.com/phoenix.zhtml?c=" . self::$compid . "&p=irol-newsArticle&id={$id}";

		// HTML
		$output = "<article>";
		$output .= "<p><time itemprop=\"date\">$date</time><a href=\"$link\" class=\"truncate\" data-length=\"155\">$title Keryx Biopharmaceuticals Announces Zerenex™ (Ferric Citrate Coordination Complex) Phase 2 Results in Non-Dialysis Dependent Chronic Kidney Disease Selected as a Late Breaking Oral Presentation at the Upcoming National Kidney Foundation</a></p>";
		$output .= "</article>";

		return $output;
	}


	/**
	 * Format event entry
	 *
	 * @param array $entry Data for a given entry
	 */
	static function events_entry( $entry = null ) {

		if ( !$entry )
			return;

		// Data
		$entry = (array) $entry;
		$strtotime = strtotime( $entry['@attributes']->EventStartDate );
		$date = date( 'n.j.Y', $strtotime );
		$title = apply_filters( 'the_title', $entry['EventTitle'] );
		$id = $entry['@attributes']->EventID;
		$link = "http://investors.keryx.com/phoenix.zhtml?c=" . self::$compid . "&p=irol-EventDetails&EventId={$id}";

		// Only show future events
		$today = strtotime( "00:00:00" );
		$output = '';
		if ( $strtotime >= $today ) {
			$output .= "<article>";
			$output .= "<p><time itemprop=\"date\">$date</time><a href=\"$link\">$title</a></p>";
			$output .= "</article>";
		}

		return $output;
	}

}

endif; // end class_exists