Question

< 坚固 > 链接到 < /强 >

No link...Use default location.
http://www.linkedin.com/favicon.ico

< 强度 > Twitter

  <link href="/phoenix/favicon.ico" rel="shortcut icon" type="image/x-icon" />

<强 > 兴趣

<link rel="icon" href="http://passets-cdn.pinterest.com/images/favicon.png" type="image/x-icon" />

< 强势 > 脸书

<link rel="shortcut icon" href="https://s-static.ak.facebook.com/rsrc.php/yi/r/q9U99v3_saj.ico" />

我确定找到猎鹰的唯一百分百的方法就是检查源头看看链接在哪里

Default location is not always used. Note first 2 examples.
Google API works only about 85% of the time. Try It Out

是否有一个函数可以解析此信息? 或者是否有一个很好的策略来使用正正方体来手动提取它。

我将解析 html 服务器的侧面以获得这个信息。

<强 > 想法:

Regex 示例 : < a href=" "http://regexpal.com/" rel=" no follow" >Try here .似乎很容易...但这里是一个起点。

<linksrel="[Ss]hortcut [Ii]con"shref="(.+)"(.+)>

Answer 1

使用解析器 :

$dom = new DOMDocument();
@$dom->loadHTML($input);
$links = $dom->getElementsByTagName( link );
$l = $links->length;
$favicon = "/favicon.ico";
for( $i=0; $i<$l; $i++) {
    $item = $links->item($i);
    if( strcasecmp($item->getAttribute("rel"),"shortcut icon") === 0) {
        $favicon = $item->getAttribute("href");
        break;
    }
}
// You now have your $favicon

Answer 2

PHP 5 DOMDocument: 原始正反

到目前为止,这适用于所有案件。

    $pattern =  #<links+(?=[^>]*rel="(?:shortcuts)?icon"s+)(?:[^>]*href="(.+?)").*>#i ;

Answer 3

你们必须围绕几个问题开展工作,比如网站重定向和各种警告。这是我为了收获90%的网站信息而做的:

<?
/*
  nws-favicon : Get site s favicon using various strategies

  This script is part of NWS
  https://github.com/xaccrocheur/nws/

*/


function CheckImageExists($imgUrl) {
    if (@GetImageSize($imgUrl)) {
        return true;
    } else {
        return false;
    };
};

function getFavicon ($url) {

$fallback_favicon = "/var/www/favicon.ico";

    $dom = new DOMDocument();
    @$dom->loadHTML($url);
    $links = $dom->getElementsByTagName( link );
    $l = $links->length;
    $favicon = "/favicon.ico";
    for( $i=0; $i<$l; $i++) {
        $item = $links->item($i);
        if( strcasecmp($item->getAttribute("rel"),"shortcut icon") === 0) {
            $favicon = $item->getAttribute("href");
            break;
        }
    }

    $u = parse_url($url);

    $subs = explode(  . , $u[ host ]);
    $domain = $subs[count($subs) -2]. . .$subs[count($subs) -1];

    $file = "http://".$domain."/favicon.ico";
    $file_headers = @get_headers($file);

    if($file_headers[0] ==  HTTP/1.1 404 Not Found  || $file_headers[0] ==  HTTP/1.1 404 NOT FOUND  || $file_headers[0] ==  HTTP/1.1 301 Moved Permanently ) {

        $fileContent = @file_get_contents("http://".$domain);

        $dom = @DOMDocument::loadHTML($fileContent);
        $xpath = new DOMXpath($dom);

        $elements = $xpath->query("head/link//@href");

        $hrefs = array();

        foreach ($elements as $link) {
            $hrefs[] = $link->value;
        }

        $found_favicon = array();
        foreach ( $hrefs as $key => $value ) {
            if( substr_count($value,  favicon.ico ) > 0 ) {
                $found_favicon[] = $value;
                $icon_key = $key;
            }
        }

        $found_http = array();
        foreach ( $found_favicon as $key => $value ) {
            if( substr_count($value,  http ) > 0 ) {
                $found_http[] = $value;
                $favicon = $hrefs[$icon_key];
                $method = "xpath";
            } else {
                $favicon = $domain.$hrefs[$icon_key];
                if (substr($favicon, 0, 4) !=  http ) {
                    $favicon =  http://  . $favicon;
                    $method = "xpath+http";
                }
            }
        }

        if (isset($favicon)) {
            if (!CheckImageExists($favicon)) {
                $favicon = $fallback_favicon;
                $method = "fallback";
            }
        } else {
            $favicon = $fallback_favicon;
            $method = "fallback";
        }

    } else {
        $favicon = $file;
        $method = "classic";

        if (!CheckImageExists($file)) {
            $favicon = $fallback_favicon;
            $method = "fallback";
        }

    }
    return $favicon;
}

?>

友情链接