Warning: file_get_contents: failed to open stream:

问题:

I read over 20 related questions on this site, searched in Google but no use. I'm new to PHP and am using PHP Simple HTML DOM Parser to fetch a URL. While this script works with local test pages, it just won't work with the URL that I need the script for.

Here is the code that I wrote for this, following an example file that came with the PHP Simple DOM parser library:

<?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;  

?>

And this is the error message that I get:

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

Please guide me what should be done to make it work. I'm new so please suggest a way that is simple. While reading other questions and their answers on this site, I tried cURL method to create a handle but I failed to make it work. The cURL method that I tried keeps returning "Resources" or "Objects". I don't know how to pass that to Simple HTML DOM Parser to make $html->find() work properly.

Please help! Thanks!

回答1:

Had a similar problem today. I was using CURL and it wasn't returning my any error. Tested with file_get_contents() and I got...

failed to open stream: Redirection limit reached, aborting in

Made a few searches and I'v ended with this function that works on my case...

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);

}

The website was checking for a valid user agent and for cookies.

The cookie issue was causing it! :) Peace!

回答2:

Resolved with:

<?php
$context = stream_context_create(
    array(
        'http' => array(
            'max_redirects' => 101
        )
    )
);
$content = file_get_contents('http://example.org/', false, $context);
?>

You can also inform if you have a proxy in the middle:

$aContext = array('http'=>array('proxy'=>$proxy,'request_fulluri'=>true));
$cxContext = stream_context_create($aContext);

More details on: https://cweiske.de/tagebuch/php-redirection-limit-reached.htm (thanks @jqpATs2w)

回答3:

Using cURL you would need to have the CURLOPT_RETURNTRANSFER option set to true in order to return the body of the request with call to curl_exec like this:

$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);

回答4:

I'm not sure exactly why you redefined the $html object with a string from get html, The object is meant to be used for searching the string. If you overwrite the object with a string, the object no longer exists and cannot be used.

In any case, to search the string returned from curl.

<?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;
?>

you might be searching a different tag, the method is the same

# just outputting a different tag attribute
echo $html->class;

echo $html->id;