问题
I want to get, requested website's favicon with PHP. I have been recommended using Google's favicon service but it is not functional. I want to do something on my own but don't know regex usage.
I found a class on Google that works on most cases but it has unacceptable error rate. You can have a look here: http://www.controlstyle.com/articles/programming/text/php-favicon/
Can somebody please help me about getting favicon using regex, please?
回答1:
PHP Grab Favicon
This is a comfortable way with many parameter to get the favicon from a page URL.
How it Works
- Check if the favicon already exists local or no save is wished, if so return path & filename
- Else load URL and try to match the favicon location with regex
- If we have a match the favicon link will be made absolute
- If we have no favicon we try to get one in domain root
- If there is still no favicon we randomly try google, faviconkit & favicongrabber API
- If favicon should be saved try to load the favicon URL
- If wished save the Favicon for the next time and return the path & filename
So it combine both ways: Try to get the Favicon from the Page and if that don't work use an "API" Service that give back the Favicon ;-)
<?php
/*
PHP Grab Favicon
================
> This `PHP Favicon Grabber` use a given url, save a copy (if wished) and return the image path.
How it Works
------------
1. Check if the favicon already exists local or no save is wished, if so return path & filename
2. Else load URL and try to match the favicon location with regex
3. If we have a match the favicon link will be made absolute
4. If we have no favicon we try to get one in domain root
5. If there is still no favicon we randomly try google, faviconkit & favicongrabber API
6. If favicon should be saved try to load the favicon URL
7. If wished save the Favicon for the next time and return the path & filename
How to Use
----------
```PHP
$url = 'example.com';
$grap_favicon = array(
'URL' => $url, // URL of the Page we like to get the Favicon from
'SAVE'=> true, // Save Favicon copy local (true) or return only favicon url (false)
'DIR' => './', // Local Dir the copy of the Favicon should be saved
'TRY' => true, // Try to get the Favicon frome the page (true) or only use the APIs (false)
'DEV' => null, // Give all Debug-Messages ('debug') or only make the work (null)
);
echo '<img src="'.grap_favicon($grap_favicon).'">';
```
Todo
----
Optional split the download dir into several sub-dirs (MD5 segment of filename e.g. /af/cd/example.com.png) if there are a lot of favicons.
Infos about Favicon
-------------------
https://github.com/audreyr/favicon-cheat-sheet
###### Copyright 2019 Igor Gaffling
*/
$testURLs = array(
'http://aws.amazon.com',
'http://www.apple.com',
'http://www.dribbble.com',
'http://www.github.com',
'http://www.intercom.com',
'http://www.indiehackers.com',
'http://www.medium.com',
'http://www.mailchimp.com',
'http://www.netflix.com',
'http://www.producthunt.com',
'http://www.reddit.com',
'http://www.slack.com',
'http://www.soundcloud.com',
'http://www.stackoverflow.com',
'http://www.techcrunch.com',
'http://www.trello.com',
'http://www.vimeo.com',
'https://www.whatsapp.com/',
'https://www.gaffling.com/',
);
foreach ($testURLs as $url) {
$grap_favicon = array(
'URL' => $url, // URL of the Page we like to get the Favicon from
'SAVE'=> true, // Save Favicon copy local (true) or return only favicon url (false)
'DIR' => './', // Local Dir the copy of the Favicon should be saved
'TRY' => true, // Try to get the Favicon frome the page (true) or only use the APIs (false)
'DEV' => null, // Give all Debug-Messages ('debug') or only make the work (null)
);
$favicons[] = grap_favicon($grap_favicon);
}
foreach ($favicons as $favicon) {
echo '<img title="'.$favicon.'" style="width:32px;padding-right:32px;" src="'.$favicon.'">';
}
echo '<br><br><tt>Runtime: '.round((microtime(true)-$_SERVER["REQUEST_TIME_FLOAT"]),2).' Sec.';
function grap_favicon( $options=array() ) {
// Ini Vars
$url = (isset($options['URL']))?$options['URL']:'gaffling.com';
$save = (isset($options['SAVE']))?$options['SAVE']:true;
$directory = (isset($options['DIR']))?$options['DIR']:'./';
$trySelf = (isset($options['TRY']))?$options['TRY']:true;
$DEBUG = (isset($options['DEV']))?$options['DEV']:null;
// URL to lower case
$url = strtolower($url);
// Get the Domain from the URL
$domain = parse_url($url, PHP_URL_HOST);
// Check Domain
$domainParts = explode('.', $domain);
if(count($domainParts) == 3 and $domainParts[0]!='www') {
// With Subdomain (if not www)
$domain = $domainParts[0].'.'.
$domainParts[count($domainParts)-2].'.'.$domainParts[count($domainParts)-1];
} else if (count($domainParts) >= 2) {
// Without Subdomain
$domain = $domainParts[count($domainParts)-2].'.'.$domainParts[count($domainParts)-1];
} else {
// Without http(s)
$domain = $url;
}
// FOR DEBUG ONLY
if($DEBUG=='debug')print('<b style="color:red;">Domain</b> #'.@$domain.'#<br>');
// Make Path & Filename
$filePath = preg_replace('#\/\/#', '/', $directory.'/'.$domain.'.png');
// If Favicon not already exists local
if ( !file_exists($filePath) or @filesize($filePath)==0 ) {
// If $trySelf == TRUE ONLY USE APIs
if ( isset($trySelf) and $trySelf == TRUE ) {
// Load Page
$html = load($url, $DEBUG);
// Find Favicon with RegEx
$regExPattern = '/((<link[^>]+rel=.(icon|shortcut icon|alternate icon)[^>]+>))/i';
if ( @preg_match($regExPattern, $html, $matchTag) ) {
$regExPattern = '/href=(\'|\")(.*?)\1/i';
if ( isset($matchTag[1]) and @preg_match($regExPattern, $matchTag[1], $matchUrl)) {
if ( isset($matchUrl[2]) ) {
// Build Favicon Link
$favicon = rel2abs(trim($matchUrl[2]), 'http://'.$domain.'/');
// FOR DEBUG ONLY
if($DEBUG=='debug')print('<b style="color:red;">Match</b> #'.@$favicon.'#<br>');
}
}
}
// If there is no Match: Try if there is a Favicon in the Root of the Domain
if ( empty($favicon) ) {
$favicon = 'http://'.$domain.'/favicon.ico';
// Try to Load Favicon
if ( !@getimagesize($favicon) ) {
unset($favicon);
}
}
} // END If $trySelf == TRUE ONLY USE APIs
// If nothink works: Get the Favicon from API
if ( !isset($favicon) or empty($favicon) ) {
// Select API by Random
$random = rand(1,3);
// Faviconkit API
if ($random == 1 or empty($favicon)) {
$favicon = 'https://api.faviconkit.com/'.$domain.'/16';
}
// Favicongrabber API
if ($random == 2 or empty($favicon)) {
$echo = json_decode(load('http://favicongrabber.com/api/grab/'.$domain,FALSE),TRUE);
// Get Favicon URL from Array out of json data (@ if something went wrong)
$favicon = @$echo['icons']['0']['src'];
}
// Google API (check also md5() later)
if ($random == 3) {
$favicon = 'http://www.google.com/s2/favicons?domain='.$domain;
}
// FOR DEBUG ONLY
if($DEBUG=='debug')print('<b style="color:red;">'.$random.'. API</b> #'.@$favicon.'#<br>');
} // END If nothink works: Get the Favicon from API
// Write Favicon local
$filePath = preg_replace('#\/\/#', '/', $directory.'/'.$domain.'.png');
// If Favicon should be saved
if ( isset($save) and $save == TRUE ) {
// Load Favicon
$content = load($favicon, $DEBUG);
// If Google API don't know and deliver a default Favicon (World)
if ( isset($random) and $random == 3 and
md5($content) == '3ca64f83fdcf25135d87e08af65e68c9' ) {
$domain = 'default'; // so we don't save a default icon for every domain again
// FOR DEBUG ONLY
if($DEBUG=='debug')print('<b style="color:red;">Google</b> #use default icon#<br>');
}
// Write
$fh = @fopen($filePath, 'wb');
fwrite($fh, $content);
fclose($fh);
// FOR DEBUG ONLY
if($DEBUG=='debug')print('<b style="color:red;">Write-File</b> #'.@$filePath.'#<br>');
} else {
// Don't save Favicon local, only return Favicon URL
$filePath = $favicon;
}
} // END If Favicon not already exists local
// FOR DEBUG ONLY
if ($DEBUG=='debug') {
// Load the Favicon from local file
if ( !function_exists('file_get_contents') ) {
$fh = @fopen($filePath, 'r');
while (!feof($fh)) {
$content .= fread($fh, 128); // Because filesize() will not work on URLS?
}
fclose($fh);
} else {
$content = file_get_contents($filePath);
}
print('<b style="color:red;">Image</b> <img style="width:32px;"
src="data:image/png;base64,'.base64_encode($content).'"><hr size="1">');
}
// Return Favicon Url
return $filePath;
} // END MAIN Function
/* HELPER load use curl or file_get_contents (both with user_agent) and fopen/fread as fallback */
function load($url, $DEBUG) {
if ( function_exists('curl_version') ) {
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_USERAGENT, 'FaviconBot/1.0 (+http://'.$_SERVER['SERVER_NAME'].'/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$content = curl_exec($ch);
if ( $DEBUG=='debug' ) { // FOR DEBUG ONLY
$http_code = curl_getinfo($ch);
print('<b style="color:red;">cURL</b> #'.$http_code['http_code'].'#<br>');
}
curl_close($ch);
unset($ch);
} else {
$context = array ( 'http' => array (
'user_agent' => 'FaviconBot/1.0 (+http://'.$_SERVER['SERVER_NAME'].'/)'),
);
$context = stream_context_create($context);
if ( !function_exists('file_get_contents') ) {
$fh = fopen($url, 'r', FALSE, $context);
$content = '';
while (!feof($fh)) {
$content .= fread($fh, 128); // Because filesize() will not work on URLS?
}
fclose($fh);
} else {
$content = file_get_contents($url, NULL, $context);
}
}
return $content;
}
/* HELPER: Change URL from relative to absolute */
function rel2abs( $rel, $base ) {
extract( parse_url( $base ) );
if ( strpos( $rel,"//" ) === 0 ) return $scheme . ':' . $rel;
if ( parse_url( $rel, PHP_URL_SCHEME ) != '' ) return $rel;
if ( $rel[0] == '#' or $rel[0] == '?' ) return $base . $rel;
$path = preg_replace( '#/[^/]*$#', '', $path);
if ( $rel[0] == '/' ) $path = '';
$abs = $host . $path . "/" . $rel;
$abs = preg_replace( "/(\/\.?\/)/", "/", $abs);
$abs = preg_replace( "/\/(?!\.\.)[^\/]+\/\.\.\//", "/", $abs);
return $scheme . '://' . $abs;
}
Source: https://github.com/gaffling/PHP-Grab-Favicon
回答2:
Use the S2 service provided by google. It is as simple as this
http://www.google.com/s2/favicons?domain=www.yourdomain.com
Scraping this would be much easier, that trying to do it yourself.
回答3:
Quick and dirty:
<?php
$url = 'http://example.com/';
$doc = new DOMDocument();
$doc->strictErrorChecking = FALSE;
$doc->loadHTML(file_get_contents($url));
$xml = simplexml_import_dom($doc);
$arr = $xml->xpath('//link[@rel="shortcut icon"]');
echo $arr[0]['href'];
回答4:
It looks like http://www.getfavicon.org/?url=domain.com (FAQ) reliably scrapes a website's favicon. I realise it's a 3rd-party service but I think it's a worthy alternative to the Google favicon service.
回答5:
According to Wikipedia, there are 2 major methods which can be used by websites to have a favicon picked up by a browser. The first is as Steve mentioned, having the icon stored as favicon.ico in the root directory of the webserver. The second is to reference the favicon via the HTML link tag.
To cover all of these cases, the best idea would be to test for the presence of the favicon.ico file first, and if it is not present, search for either the <link rel="icon" or <link rel="shortcut icon" part in the source (limited to the HTML head node) until you find the favicon. It is up to you whether you choose to use regex, or some other string search option (not to mention the built in PHP ones). Finally, this question may be of some help to you.
回答6:
I've been doing something similar and I checked this with a bunch of URL and all seemed to work. URL doesn't have to be a base URL
function getFavicon($url){
# make the URL simpler
$elems = parse_url($url);
$url = $elems['scheme'].'://'.$elems['host'];
# load site
$output = file_get_contents($url);
# look for the shortcut icon inside the loaded page
$regex_pattern = "/rel=\"shortcut icon\" (?:href=[\'\"]([^\'\"]+)[\'\"])?/";
preg_match_all($regex_pattern, $output, $matches);
if(isset($matches[1][0])){
$favicon = $matches[1][0];
# check if absolute url or relative path
$favicon_elems = parse_url($favicon);
# if relative
if(!isset($favicon_elems['host'])){
$favicon = $url . '/' . $favicon;
}
return $favicon;
}
return false;
}
回答7:
I've implemented a favicon grabber of my own, and I detailed the usage in another StackOverflow post here: Get website's favicon with JS
Thanks, and let me know if it helps you. Also, any feedback is greatly appreciated.
回答8:
First Method in which we can search it from fevicon.ico if found than it will show it up else not
<?php
$userPath=$_POST["url"];
$path="http://www.".$userPath."/favicon.ico";
$header= get_headers($path);
if(preg_match("|200|", $header[0]))
{
echo '<img src="'.$path.'">';
}
else
{
echo "<span class=error>Not found</span>";
}
?>
In other method you can search for icon and get that icon file
<?php
$website=$_POST["url"];
$fevicon= getFavicon($website);
echo '<img src="http://www.'.$website.'/'.$fevicon.'">';
function getFavicon($site)
{
$html=file_get_contents("http://www.".$site);
$dom=new DOMDocument();
@$dom->loadHTML($html);
$links=$dom->getElementsByTagName('link');
$fevicon='';
for($i=0;$i < $links->length;$i++ )
{
$link=$links->item($i);
if($link->getAttribute('rel')=='icon'||$link->getAttribute('rel')=="Shortcut Icon"||$link->getAttribute('rel')=="shortcut icon")
{
$fevicon=$link->getAttribute('href');
}
}
return $fevicon;
}
?>
回答9:
See this answer : https://stackoverflow.com/a/22771267. It's an easy to use PHP class to get the favicon URL and download it, and it also gives you some informations about the favicon like file type or how the favicon was found (default URL, <link> tag...) :
<?php
require 'FaviconDownloader.class.php';
$favicon = new FaviconDownloader('https://code.google.com/p/chromium/issues/detail?id=236848');
if($favicon->icoExists){
echo "Favicon found : ".$favicon->icoUrl."\n";
// Saving favicon to file
$filename = 'favicon-'.time().'.'.$favicon->icoType;
file_put_contents($filename, $favicon->icoData);
echo "Saved to ".$filename."\n\n";
} else {
echo "No favicon for ".$favicon->url."\n\n";
}
$favicon->debug();
/*
FaviconDownloader Object
(
[url] => https://code.google.com/p/chromium/issues/detail?id=236848
[pageUrl] => https://code.google.com/p/chromium/issues/detail?id=236848
[siteUrl] => https://code.google.com/
[icoUrl] => https://ssl.gstatic.com/codesite/ph/images/phosting.ico
[icoType] => ico
[findMethod] => head absolue_full
[error] =>
[icoExists] => 1
[icoMd5] => a6cd47e00e3acbddd2e8a760dfe64cdc
)
*/
?>
回答10:
If you want to retrieve the favicon from a particular website, you simply need to fetch favicon.ico from the root of their website. Like so:
$domain = "www.example.com";
$url = "http://".$domain."/favicon.ico";
$icondata = file_get_contents($url);
... you can now do what you like with the icon data
回答11:
Found this thread... I have written a WordPress plugin that encompasses a lot of variations on retrieving the favicon. Since there are a lot the GPL code: http://plugins.svn.wordpress.org/wp-favicons/trunk/
It lets you run a server which you can request icons from via xml rpc requests so any client can request icons. It does have a plugin structure so you can try google, getfavicon, etc... to see if one of these services delivers anything. If not then it goes into a icon fetching mode taking into account all http statusses (301/302/404) and does it best to find an icon anywhere. After this it uses image library functions to check inside the file if it is really an image and what kind of image (sometimes the extension is wrong) and it is pluggable so you can add after image conversions or extra functionality in the pipeline.
the http fetching file does some logic around what i see above: http://plugins.svn.wordpress.org/wp-favicons/trunk/includes/server/class-http.php
but it is only part of the pipeline.
can get pretty complex once you dive into it.
回答12:
$url = 'http://thamaraiselvam.strikingly.com/';
$doc = new DOMDocument();
$doc->strictErrorChecking = FALSE;
@$doc->loadHTML(file_get_contents($url));
$xml = simplexml_import_dom($doc);
$arr = $xml->xpath('//link[@rel="shortcut icon"]');
if (!empty($arr[0]['href'])) {
echo "<img src=".$arr[0]['href'].">";
}
else
echo "<img src='".$url."/favicon.ico'>";
回答13:
I changed a bit Vivek second method and added a this function and it looks like this:
<?php
$website=$_GET['u'];
$fevicon= getFavicon($website);
echo '<img src="'.path_to_absolute($fevicon,$website).'"></img>';
function getFavicon($site)
{
$html=file_get_contents($site);
$dom=new DOMDocument();
@$dom->loadHTML($html);
$links=$dom->getElementsByTagName('link');
$fevicon='';
for($i=0;$i < $links->length;$i++ )
{
$link=$links->item($i);
if($link->getAttribute('rel')=='icon'||$link->getAttribute('rel')=="Shortcut Icon"||$link->getAttribute('rel')=="shortcut icon")
{
$fevicon=$link->getAttribute('href');
}
}
return $fevicon;
}
// transform to absolute path function...
function path_to_absolute($rel, $base)
{
/* return if already absolute URL */
if (parse_url($rel, PHP_URL_SCHEME) != '') return $rel;
/* queries and anchors */
if ($rel[0]=='#' || $rel[0]=='?') return $base.$rel;
/* parse base URL and convert to local variables:
$scheme, $host, $path */
extract(parse_url($base));
/* remove non-directory element from path */
$path = preg_replace('#/[^/]*$#', '', $path);
/* destroy path if relative url points to root */
if ($rel[0] == '/') $path = '';
/* dirty absolute URL */
$abs = "$host$path/$rel";
/* replace '//' or '/./' or '/foo/../' with '/' */
$re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
for($n=1; $n>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}
/* absolute URL is ready! */
return $scheme.'://'.$abs;
}
?>
Of course you call it with https://www.domain.tld/favicon/this_script.php?u=http://www.example.com
Still can't catch all options but now absolute path is resolved. Hope it helps.
来源：https://stackoverflow.com/questions/5701593/how-to-get-a-websites-favicon-with-php