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Edit File: class-wp-simplepie-file.php

<?php
/**
 * Feed API: WP_SimplePie_File class
 *
 * @package WordPress
 * @subpackage Feed
 * @since 4.7.0
 */

/**
 * Core class for fetching remote files and reading local files with SimplePie.
 *
 * @since 2.8.0
 *
 * @see SimplePie_File
 */
class WP_SimplePie_File extends SimplePie_File {

/**
	 * Constructor.
	 *
	 * @since 2.8.0
	 * @since 3.2.0 Updated to use a PHP5 constructor.
	 *
	 * @param string       $url             Remote file URL.
	 * @param integer      $timeout         Optional. How long the connection should stay open in seconds.
	 *                                      Default 10.
	 * @param integer      $redirects       Optional. The number of allowed redirects. Default 5.
	 * @param string|array $headers         Optional. Array or string of headers to send with the request.
	 *                                      Default null.
	 * @param string       $useragent       Optional. User-agent value sent. Default null.
	 * @param boolean      $force_fsockopen Optional. Whether to force opening internet or unix domain socket
	 *                                      connection or not. Default false.
	 */
	public function __construct($url, $timeout = 10, $redirects = 5, $headers = null, $useragent = null, $force_fsockopen = false) {
		$this->url = $url;
		$this->timeout = $timeout;
		$this->redirects = $redirects;
		$this->headers = $headers;
		$this->useragent = $useragent;

$this->method = SIMPLEPIE_FILE_SOURCE_REMOTE;

if ( preg_match('/^http(s)?:\/\//i', $url) ) {
			$args = array(
				'timeout' => $this->timeout,
				'redirection' => $this->redirects,
			);

if ( !empty($this->headers) )
				$args['headers'] = $this->headers;

if ( SIMPLEPIE_USERAGENT != $this->useragent ) //Use default WP user agent unless custom has been specified
				$args['user-agent'] = $this->useragent;

$res = wp_safe_remote_request($url, $args);

if ( is_wp_error($res) ) {
				$this->error = 'WP HTTP Error: ' . $res->get_error_message();
				$this->success = false;
			} else {
				$this->headers = wp_remote_retrieve_headers( $res );
				$this->body = wp_remote_retrieve_body( $res );
				$this->status_code = wp_remote_retrieve_response_code( $res );
			}
		} else {
			$this->error = '';
			$this->success = false;
		}
	}
}

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