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Validate a RSS feed with feedvalidator.org service
<?php
/*
Feed Validator PHP class (feed_validator.class.php) is intended for feed validation
It is a proxy to http://feedvalidator.org/
Greetings to http://feedvalidator.org/
License:
Free for commercial or non-commercial use.
All kind of modifications,improvements is granted but my author details must be
intact AND all patches made by you to the original code must be marked.
provided "AS IS" without any warranties.
Svetoslav Marinov
svetoslavm#gmail.com
http://feed-validator.devquickref.com
*/
/**
* Feed Validator PHP class (feed_validator.class.php) is intended for feed validation
* It is a proxy to http://feedvalidator.org/
*
* @author Svetoslav Marinov <svetoslavm#gmail.com>
* @link http://feed-validator.devquickref.com
*/
class feed_validator {
/**
* class constructor
* @param void
* @return void
* @return dynphp
*/
function feed_validator() {
$this->validator_url = "http://feedvalidator.org/check.cgi?url=";
}
/**
* validate a feed
*
* @param string $feed
* @return bool
*/
function validate($feed) {
if (empty($feed))
return false;
if (!preg_match("@^http://@si", $feed))
$feed = "http://" . $feed;
// submitting to feedvalidator.org and checking the result
if ($this->get($feed)
&& !empty($this->buffer)
&& !preg_match("@sorry@si", $this->buffer)) {
return true;
}
return false;
}
/**
* retrieve
* @param void
* @return string
*/
function get($feed) {
$url = $this->validator_url . $feed;
// try #1 fopen
$fp = @fopen($url, "r");
if (!empty($fp)) {
$in = '';
while (!feof($fp)) {
$in .= fgets($fp, 4096);
}
@fclose($fp);
$this->buffer = $in;
}
// try #2 fsockopen
if (empty($fp)) {
$url_parsed = parse_url($url);
$host = @$url_parsed["host"];
$port = @$url_parsed["port"];
if ($port == 0)
$port = 80;
$path = @$url_parsed["path"];
//if url is http://example.com without final "/"
//I was getting a 400 error
if (empty($path))
$path="/";
if (!preg_match("@\?@si", $path)) {
$path .= "?url=".rawurlencode($feed);
}
//redirection if url is in wrong format
if (empty($host))
return false;
$ua = "User-Agent: feed_validator/1.0 (feed_validator PHP class; +http://feed-validator.devquickref.com)\r\n";
$out = "GET $path HTTP/1.0\r\n{$ua}Host: $host\r\n\r\n";
$fp = @fsockopen($host, $port, $errno, $errstr, 30);
fwrite($fp, $out);
$body = false;
$in = '';
while (!feof($fp)) {
$in .= fgets($fp, 4096);
}
$in = split("\r\n\r\n", $in, 2);
fclose($fp);
$this->buffer = $in[1];
print $this->buffer;
}
# try #3 cURL
// http://fr.php.net/manual/en/function.fopen.php
if (empty($fp) && function_exists("curl_init") && extension_loaded('curl')) {
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_HEADER, 0);
curl_setopt ($ch, CURLOPT_TIMEOUT, 30);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt ($ch, CURLOPT_USERAGENT, "feed_validator/1.0 (feed_validator PHP class; +http://feed-validator.devquickref.com)");
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
$string = curl_exec($ch);
curl_close($ch);
if (strlen($string))
$this->buffer = $string;
}
}
}
?>
<?
//feed_validator_example.php
//How we use feed_validator_example.php
require_once("feed_validator.class.php");
$obj =& new feed_validator();
//if ($obj->validate("http://yahoo.com/"))
if ($obj->validate("http://rss.news.yahoo.com/rss/hotzone"))
print "Feed OK...\n";
else
print "Not valid.";
?>
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