81 lines
2.0 KiB
Markdown
81 lines
2.0 KiB
Markdown
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Favicon fetcher
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===============
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Find and download the favicon
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-----------------------------
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```php
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use PicoFeed\Reader\Favicon;
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$favicon = new Favicon;
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// The icon link is https://bits.wikimedia.org/favicon/wikipedia.ico
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$icon_link = $favicon->find('https://en.wikipedia.org/');
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$icon_content = $favicon->getContent();
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```
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PicoFeed will try first to find the favicon from the meta tags and fallback to the `favicon.ico` located in the website's root if nothing is found.
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- `Favicon::find()` returns the favicon absolute url or an empty string if nothing is found.
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- `Favicon::getContent()` returns the favicon file content (binary content)
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When the HTML page is parsed, relative links and protocol relative links are converted to absolute url.
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Get Favicon file type
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---------------------
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It's possible to fetch the image type, this information come from the Content-Type HTTP header:
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```php
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$favicon = new Favicon;
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$favicon->find('http://example.net/');
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echo $favicon->getType();
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// Will output the content type, by example "image/png"
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```
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Get the Favicon as Data URI
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---------------------------
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You can also get the whole image as Data URI.
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It's useful if you want to store the icon in your database and avoid too many HTTP requests.
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```php
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$favicon = new Favicon;
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$favicon->find('http://example.net/');
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echo $favicon->getDataUri();
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// Output something like that: data:image/png;base64,iVBORw0KGgoAAAANSUh.....
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```
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See: http://en.wikipedia.org/wiki/Data_URI_scheme
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Check if a favicon link exists
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------------------------------
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```php
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use PicoFeed\Reader\Favicon;
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$favicon = new Favicon;
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// Return true if the file exists
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var_dump($favicon->exists('http://php.net/favicon.ico'));
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```
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Use personalized HTTP settings
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------------------------------
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Like other classes, the Favicon class support the Config object as constructor argument:
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```php
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use PicoFeed\Config\Config;
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use PicoFeed\Reader\Favicon;
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$config = new Config;
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$config->setClientUserAgent('My RSS Reader');
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$favicon = new Favicon($config);
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$favicon->find('https://github.com');
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```
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