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<?php namespace simplehtmldom;
/**
* Website: http://sourceforge.net/projects/simplehtmldom/
* Acknowledge: Jose Solorzano (https://sourceforge.net/projects/php-html/)
*
* Licensed under The MIT License
* See the LICENSE file in the project root for more information.
*
* Authors:
* S.C. Chen
* John Schlick
* Rus Carroll
* logmanoriginal
*
* Contributors:
* Yousuke Kumakura
* Vadim Voituk
* Antcs
*
* Version Rev. 2.0-RC2 (415)
*/
include_once 'HtmlDocument.php';
class HtmlWeb {
/**
* @return HtmlDocument Returns the DOM for a webpage
* @return null Returns null if the cURL extension is not loaded and allow_url_fopen=Off
* @return null Returns null if the provided URL is invalid (not PHP_URL_SCHEME)
* @return null Returns null if the provided URL does not specify the HTTP or HTTPS protocol
*/
function load($url)
{
if(!filter_var($url, FILTER_VALIDATE_URL)) {
return null;
}
if($scheme = parse_url($url, PHP_URL_SCHEME)) {
switch(strtolower($scheme)) {
case 'http':
case 'https': break;
default: return null;
}
if(extension_loaded('curl')) {
return $this->load_curl($url);
} elseif(ini_get('allow_url_fopen')) {
return $this->load_fopen($url);
} else {
error_log(__FUNCTION__ . ' requires either the cURL extension or allow_url_fopen=On in php.ini');
}
}
return null;
}
/**
* cURL implementation of load
*/
private function load_curl($url)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
// There is no guarantee this request will be fulfilled
// -- https://www.php.net/manual/en/function.curl-setopt.php
curl_setopt($ch, CURLOPT_BUFFERSIZE, MAX_FILE_SIZE);
// There is no guarantee this request will be fulfilled
$header = array(
'Accept: text/html', // Prefer HTML format
'Accept-Charset: utf-8', // Prefer UTF-8 encoding
);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
$doc = curl_exec($ch);
if(curl_getinfo($ch, CURLINFO_RESPONSE_CODE) !== 200) {
return null;
}
curl_close($ch);
if(strlen($doc) > MAX_FILE_SIZE) {
return null;
}
return new HtmlDocument($doc);
}
/**
* fopen implementation of load
*/
private function load_fopen($url)
{
// There is no guarantee this request will be fulfilled
$context = stream_context_create(array('http' => array(
'header' => array(
'Accept: text/html', // Prefer HTML format
'Accept-Charset: utf-8', // Prefer UTF-8 encoding
),
'ignore_errors' => true // Always fetch content
)));
$doc = file_get_contents($url, false, $context, 0, MAX_FILE_SIZE + 1);
if(isset($http_response_header)) {
foreach($http_response_header as $rh) {
// https://stackoverflow.com/a/1442526
$parts = explode(' ', $rh, 3);
if(preg_match('/HTTP\/\d\.\d/', $parts[0])) {
$code = $parts[1];
}
} // Last code is final status
if(!isset($code) || $code !== '200') {
return null;
}
}
if(strlen($doc) > MAX_FILE_SIZE) {
return null;
}
return new HtmlDocument($doc);
}
}
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