Favicon Check : Help!

[donatello]

I am making a simple script to check if a site has a favicon, and if so, to display it.

Here is the test script with a form:
http://www.metataggenerator.org/anal...viconcheck.php

As you can see, it is a work in progress...

There are three functions that I would like to do:
1.) Test to see if there is a favicon in the root directory, and if so, display it.
2.) Report if there is a favicon tag, and if so...
3.) Extract and display the favicon meta tag if it exists.

The first function is not working... I have tried a number of ways and cannot get it to properly report if there is no favicon in the root directory.

Here is the code:

<form action="faviconcheck.php" method="post">
<input type="text" name="url" value="http://www.metataggenerator.org" size="50" />
&larr; Enter URL into this field and click &quot;Favicon Check&quot; (use http://)<br />
<input type="submit" value="Favicon Check" />
</form><br />
<p>&nbsp;</p>
<?php


echo '<b>1.) First Function: Test to see if favicon exists</b><br />';  

function fileExists($path) {
 if(@file_get_contents($path,0,NULL,0,1)){return 1;}else{ return 0;}
 } 
$url = $_POST['url']; 
$path = "$url/favicon.ico";

if (fileExists($path) == 1) {
    echo "<img src=\"$path\"> &larr; Favicon is in the root directory";
} else {
    echo 'There is no favicon in the root directory';
}
echo '<hr />';
echo '<b>2.) Second Function: Extract the Favicon tag and display if exists</b><br />'; 

$page = file_get_contents("$url");

$explodefirst = explode('icon"',$page);
$headerisgone = $explodefirst[1];
$explodesecond = explode('>',$headerisgone);
$faviconlink = $explodesecond[0];

$explodefirst = explode('href="',$faviconlink);
$headerisgone = $explodefirst[1];
$explodesecond = explode('"',$headerisgone);
$faviconlink = $explodesecond[0];

echo "<img src=\"$faviconlink\"> &larr; Favicon.<br />";
echo $faviconlink;



echo '<hr />';
echo '<b>3.) Third Function: Report if there is a favicon tag.</b>';
echo '<br />';
$file = file_get_contents("$url");
if(!strpos($file, '<link rel="shortcut icon"')) {
       echo '<font color="red">There is no favicon/shortcut tag.</font><br />';
       } else {
echo 'There is a favicon/shortcut tag.<br />';
}
echo '<hr />';


?>

[NogDog]

This was fun:

<?php
class FavIcon {
   /**
    * @var string URL to search for icon
    */
   private $pageUrl;
   /**
    * @var array Results of parse_url()
    */
   private $urlParts;
   /**
    * @var string URL to favicon
    */
   private $iconUrl;
   /**
    * @var string How the favicon was located: 'site root' | 'link tag'
    */
   private $iconSource;
   /**
    * Constructor
    * @return void
    * @param string $pageUrl
    */
   public function __construct($pageUrl)
   {
      $parts = parse_url($pageUrl);
      if($parts == false) {
         throw new Exception("Unable to parse URL");
      }
      $this->pageUrl = $pageUrl;
      $this->urlParts = $parts;
      if(!$this->getRootIcon()) {
         $this->getLinkIcon();
      }
   }
   /**
    * Getter for class vars
    * @return mixed
    * @param string $var
    */
   public function __get($var)
   {
      if(property_exists($this, $var)) {
         return $this->$var;
      }
      else {
         throw new Exception("Invalid class var '$var'");
      }
   }
   /**
    * Look for favicon.ico file in site root
    * @return bool
    */
   private function getRootIcon()
   {
      $url = $this->urlParts['scheme'] . '://' . $this->urlParts['host'] .
             '/favicon.ico';
      $curl = curl_init($url);
      curl_setopt($curl, CURLOPT_NOBODY, true);
      curl_setopt($curl, CURLOPT_HEADER, true);
      curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
      $result = curl_exec($curl);
      curl_close($curl);
      if(stripos($result, '200 OK')) {
         $this->iconUrl = $url;
         $this->iconSource = 'site root';
         return true;
      }
      return false;
   }
   /**
    * Look for favicon in a link tag
    * @return bool
    */
   private function getLinkIcon()
   {
      $curl = curl_init($this->pageUrl);
      curl_setopt($curl, CURLOPT_HEADER, false);
      curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
      $result = curl_exec($curl);
      curl_close($curl);
      if(!empty($result)) {
         $dom = new DOMDocument();
         if(@$dom->loadHTML($result)) {
            $links = $dom->getElementsByTagName('link');
            foreach($links as $link) {
               if($link->hasAttribute('rel') and $link->hasAttribute('href')) {
                  $rel = strtolower($link->getAttribute('rel'));
                  if($rel == 'shortcut icon' or $rel == 'icon') {
                     $this->iconUrl = $link->getAttribute('href');
                     $parts = parse_url($this->iconUrl);
                     if(empty($parts['host'])) {
                        $this->iconUrl = $this->urlParts['scheme'] . '://' .
                        $this->urlParts['host'] . $parts['path'];
                     }
                     $this->iconSource = 'link tag';
                     return true;
                  }
               }
            }
         }
      }
      return false;
   }
}

// TEST:
$test = new FavIcon('http://www.ebookworm.us/');
if(strlen($test->iconUrl)) {
   echo "<p><img src='$test->iconUrl' alt=''> ({$test->iconSource})</p>";
}
else {
   echo "<p>No Favicon found.</p>";
}

[donatello]

Wow.
Awesome work.

I play with scripts as a hobby, but have a long way to go to catch up with some of the folks around here...

There is one place where this script misses the favicon, my previous script identified the URL, although it was a lot messier code... (like most of my code!)

For WordPress Sites that have the Favicon in the theme, like this one:
http://www.TruthNeverDies.com

The old script actually extracted the Favicon URL...
(OLD SCRIPT: http://www.metataggenerator.org/anal...oncheckOLD.php )

Any ideas?

Thanks again...

BTW: Your script is up with a form to enter URLs:
http://www.metataggenerator.org/anal...viconcheck.php

[NogDog]

Wow.
...
There is one place where this script misses the favicon, my previous script identified the URL, although it was a lot messier code... (like most of my code!)

For WordPress Sites that have the Favicon in the theme, like this one:
http://www.TruthNeverDies.com

The old script actually extracted the Favicon URL...
(OLD SCRIPT: http://www.metataggenerator.org/anal...oncheckOLD.php )

Any ideas?
...

It finds it fine for me at the site root.

// TEST:
$test = new FavIcon('http://www.truthneverdies.com/');
if(strlen($test->iconUrl)) {
   echo "<p><img src='$test->iconUrl' alt=''> ({$test->iconSource})</p>";
}
else {
   echo "<p>No Favicon found.</p>";
} 

Source of output:

<p><img src='http://www.truthneverdies.com/favicon.ico' alt=''> (site root)</p>

[donatello]

Ooops...

looks like there are two favicons in that theme... the one that appears in the theme subdirectory, and the author also placed one in the root.

I wonder how it works for sites that have it only in the theme...???

Thanks again...

I'm going to incorporate this into my newest toy...

http://www.metataggenerator.org/meta-tag-analyzer/

[NogDog]

My understanding is that browsers will only find it if it's a favicon.ico file in the site root, or else if it's specified in an appropriate link tag. Anything else, and the browser is not going to know about it (at least in terms of it being a favicon).