Shariff is used to determine how often a page is shared in social media, but without generating requests from the displaying page to the social sites.

This document describes the PHP backend. The following backends are also available:

• shariff-backend-node
• shariff-backend-perl

• AddThis
• Facebook
• Flattr
• GooglePlus
• LinkedIn
• Pinterest
• Reddit
• StumbleUpon
• Xing

To run Shariff PHP Backend on your server you need:

• PHP 5.5 or greater

To run Shariff under a certain URL, unzip the release zip file into a directory under the document root of your web server.

This zip file contains a configuration file shariff.json. The following configuration options are available:

By default Shariff uses the Filesystem cache. By specifying a different adapter from Zend\Cache\Storage\Adapter you can tell Shariff to use another cache. Also you can specify options for that cache adapter

These option apply for the default Cache class (ZendCache) only. If you implement custom caching, you can specify your own options.

The backend uses Guzzle as HTTP client. Guzzle has many options that you can set, e.g. timeout and connect_timeout. See http://docs.guzzlephp.org/en/latest/request-options.html for a detailed list. In order to set those options pass them in the json with the key "client".

To pass config options to a service, you can add them to the json as well under the name of the service. Currently only the Facebook service has options for an facebook application id and client secret in order to use the graph api id method to get the current share count.

To use the graph api id method to fetch the share count you need to set up an application at facebook.com and pass in the application id and client secret to the options. It seems that the id method returns the most current share count, but it can be only used with an registered application.

{
	"cacheClass": "Heise\\Shariff\\ZendCache",
	"cache": {
		"ttl": 60,
		"cacheDir": "/tmp/shariff/cache",
		"adapter": "Filesystem",
		"adapterOptions": {
			// ...
		}
	},
	"client": {
		"timeout": 4.2,
		// ... (see "Client options")
	},
	"domain": "www.example.com",
	"services": [
		"GooglePlus",
		"Facebook",
		"LinkedIn",
		"Reddit",
		"StumbleUpon",
		"Flattr",
		"Pinterest",
		"Xing",
		"AddThis"
	],
	"Facebook": {
		"app_id": "1234567890",
		"secret": "terces"
	}
}

If the backend runs under http://example.com/my-shariff-backend/, calling the URL http://example.com/my-shariff-backend/?url=http%3A%2F%2Fwww.example.com should return a JSON structure with numbers in it, e.g.:

{"facebook":1452,"googleplus":23,"linkedin":118,"reddit":7,"stumbleupon":4325,"flattr":0,"pinterest":3,"addthis":33}

If you need more control, you can invoke Shariff in your own PHP code. The following snippet should get you started. $options are identical to those described above.

use Heise\Shariff\Backend;

$options = [
	"domain"   => "www.heise.de",
	"cache"    => ["ttl" => 1],
	"services" => ["Facebook", "GooglePlus", "LinkedIn", "Reddit", "StumbleUpon", "Flattr", "Pinterest", "AddThis"]
];
$shariff = new Backend($options);
$counts = $shariff->get("http://www.heise.de/");
echo $counts["facebook"];