我在本网站上阅读了20多个相关问题,在谷歌搜索但没有用。我是PHP的新手,我正在使用PHP Simple HTML DOM Parser来获取URL。虽然此脚本适用于本地测试页,但它不适用于我需要脚本的URL。
以下是我为此编写的代码,遵循PHP Simple DOM解析器库附带的示例文件:
<?php
include('simple_html_dom.php');
$html = file_get_html('http://www.farmersagent.com/Results.aspx?isa=1&name=A&csz=AL');
foreach($html->find('li.name ul#generalListing') as $e)
echo $e->plaintext;
?>
这是我收到的错误消息:
Warning: file_get_contents(http://www.farmersagent.com/Results.aspx?isa=1&name=A&csz=AL) [function.file-get-contents]: failed to open stream: Redirection limit reached, aborting in /home/content/html/website.in/test/simple_html_dom.php on line 70
请指导我应该做些什么来使其发挥作用。我是新人,所以请提出一个简单的方法。在阅读本网站上的其他问题及其答案时,我尝试使用cURL方法创建句柄,但是我没能使它工作。我尝试的cURL方法不断返回“资源”或“对象”。我不知道如何将它传递给Simple HTML DOM Parser以使$ html-&gt; find()正常工作。
请帮忙! 谢谢!
答案 0 :(得分:7)
今天有类似的问题。我使用的是CURL,它没有返回任何错误。用file_get_contents()测试,我得到了......
无法打开流:已达到重定向限制,正在
中止进行了一些搜索,我结束了这个适合我案例的功能......
function getPage ($url) {
$useragent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.89 Safari/537.36';
$timeout= 120;
$dir = dirname(__FILE__);
$cookie_file = $dir . '/cookies/' . md5($_SERVER['REMOTE_ADDR']) . '.txt';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_FAILONERROR, true);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file);
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true );
curl_setopt($ch, CURLOPT_ENCODING, "" );
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true );
curl_setopt($ch, CURLOPT_AUTOREFERER, true );
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout );
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout );
curl_setopt($ch, CURLOPT_MAXREDIRS, 10 );
curl_setopt($ch, CURLOPT_USERAGENT, $useragent);
curl_setopt($ch, CURLOPT_REFERER, 'http://www.google.com/');
$content = curl_exec($ch);
if(curl_errno($ch))
{
echo 'error:' . curl_error($ch);
}
else
{
return $content;
}
curl_close($ch);
}
网站正在检查有效的用户代理和 Cookie 。
Cookie问题导致了它! :) 和平!
答案 1 :(得分:4)
已解决:
<?php
$context = stream_context_create(
array(
'http' => array(
'max_redirects' => 101
)
)
);
$content = file_get_contents('http://example.org/', false, $context);
?>
如果中间有代理,您也可以通知:
$aContext = array('http'=>array('proxy'=>$proxy,'request_fulluri'=>true));
$cxContext = stream_context_create($aContext);
更多详细信息:https://cweiske.de/tagebuch/php-redirection-limit-reached.htm(感谢@ jqpATs2w)
答案 2 :(得分:1)
使用cURL,您需要将CURLOPT_RETURNTRANSFER选项设置为true,以便通过调用此curl_exec
来返回请求正文:
$url = 'http://www.farmersagent.com/Results.aspx?isa=1&name=A&csz=AL';
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
// you may set this options if you need to follow redirects. Though I didn't get any in your case
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
$content = curl_exec($curl);
curl_close($curl);
$html = str_get_html($content);
答案 3 :(得分:1)
我还需要添加此 HTTP 上下文选项 ignore_errors
:
见:https://www.php.net/manual/en/context.http.php
$arrContextOptions = array(
"ssl" => array(
// skip error "Failed to enable crypto" + "SSL operation failed with code 1."
"verify_peer" => false,
"verify_peer_name" => false,
),
// skyp error "failed to open stream: operation failed" + "Redirection limit reached"
'http' => array(
'max_redirects' => 101,
'ignore_errors' => '1'
),
);
$file = file_get_contents($file_url, false, stream_context_create($arrContextOptions));
显然,我仅将它用于在本地环境中进行快速调试。 不用于生产。
答案 4 :(得分:0)
我不确定你为什么用get html中的字符串重新定义$ html对象,该对象用于搜索字符串。如果用字符串覆盖对象,则该对象不再存在且无法使用。
无论如何,要搜索curl返回的字符串。
<?php
$url = 'http://www.example.com/Results.aspx?isa=1&name=A&csz=AL';
include('simple_html_dom.php');
# create object
$html = new simple_html_dom();
#### CURL BLOCK ####
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
# you may set this options if you need to follow redirects.
# Though I didn't get any in your case
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
$content = curl_exec($curl);
curl_close($curl);
# note the variable change.
$string = str_get_html($content);
# load the curl string into the object.
$html->load($string);
#### END CURL BLOCK ####
# without the curl block above you would just use this.
$html->load_file($url);
# choose the tag to find, you're not looking for attributes here.
$html->find('a');
# this is looking for anchor tags in the given string.
# you output the attributes contents using the name of the attribute.
echo $html->href;
?>
你可能正在搜索不同的标签,方法是相同的
# just outputting a different tag attribute
echo $html->class;
echo $html->id;