Question

我正在寻找一个URL并跟踪它经历的每个URL。出于某种原因，如果不执行不理想的递归cURL调用，我无法完成此操作。也许我错过了一些简单的选择。想法？

 $url = "some url with redirects";
 $ch = curl_init($url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
 curl_setopt($ch, CURLOPT_HEADER, true);
 curl_setopt($ch, CURLOPT_NOBODY, false);
 curl_setopt($ch, CURLOPT_TIMEOUT, 10);
 curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
 curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1) Gecko/20061024 BonEcho/2.0");

 $html = curl_exec($ch);
 $info = array();
 if(!curl_errno($ch))
 {
      $info = curl_getinfo($ch);
      echo "<pre>";
      print_r($info);
      echo "</pre>";
 }

我收到了这样的回复

Array
(
    [url] => THE LAST URL THAT WAS HIT
    [content_type] => text/html; charset=utf-8
    [http_code] => 200
    [header_size] => 1942
    [request_size] => 1047
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 2   <---- I WANT THESE
    [total_time] => 0.799589
    [namelookup_time] => 0.000741
    [connect_time] => 0.104206
    [pretransfer_time] => 0.104306
    [size_upload] => 0
    [size_download] => 49460
    [speed_download] => 61856
    [speed_upload] => 0
    [download_content_length] => 49460
    [upload_content_length] => 0
    [starttransfer_time] => 0.280781
    [redirect_time] => 0.400723
)

Answer 1

你有

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

这意味着cURL将遵循重定向并仅返回没有位置标题的最终页面。

手动关注位置：

function getWebPage($url, $redirectcallback = null){
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_NOBODY, false);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
    curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1) Gecko/20061024 BonEcho/2.0");

    $html = curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    if ($http_code == 301 || $http_code == 302) {
        list($httpheader) = explode("\r\n\r\n", $html, 2);
        $matches = array();
        preg_match('/(Location:|URI:)(.*?)\n/', $httpheader, $matches);
        $nurl = trim(array_pop($matches));
        $url_parsed = parse_url($nurl);
        if (isset($url_parsed)) {
            if($redirectcallback){ // callback
                 $redirectcallback($nurl, $url);
            }
            $html = getWebPage($nurl, $redirectcallback);
        }
    }
    return $html;
}

function trackAllLocations($newUrl, $currentUrl){
    echo $currentUrl.' ---> '.$newUrl."\r\n";
}

getWebPage('some url with redirects', 'trackAllLocations');

Answer 2

使用libcurl，您可以使用CURLINFO_REDIRECT_URL getinfo变量查找将重定向到的URL（如果已启用）。这允许程序轻松遍历重定向本身。

这种方法比解析其他人在此处建议的Location:标题更好，更容易，因为那时你的代码必须重建相对路径等。CURLINFO_REDIRECT_URL自动为你修复。

PHP / CURL绑定在PHP 5.3.7中添加了support for this feature：

$url = curl_getinfo($ch, CURLINFO_REDIRECT_URL)

修复此问题的提交：

https://github.com/php/php-src/commit/689268a0ba4259c8f199cae6343b3d17cab9b6a5

Answer 3

我可以提出建议......

 preg_match('/(Location:|URI:)(.*?)\n/', $httpheader, $matches);

将正则表达式更改为/(Location:|URI:)(.*?)\n/i，因此它不区分大小写。我注意到有一些网站/地方正在使用位置：其中L是小写的。

只是想帮助那些想知道为什么有时它不起作用的人......看看那个。

PHP：cURL并跟踪所有重定向

3 个答案: