From Facebook Developer Wiki

Note: Support for this method is temporarily disabled until we support user-level permissions. You can still make this call, but you must include your application secret.

Atomically increases a numeric property by a hash key. Note that this is different than "setHashValue(getHashValue() + increment)", which has two API functions calls that are not atomically done (subject to race conditions with values overwritten by interleaved API calls).

Contents 1 Parameters 2 Return Value 3 PHP Client Coding Examples 4 FQL Equivalent 5 Error codes

[edit] Parameters

Type	Name	Description
string	api_key	The application key associated with the calling application.
string	session_key	The session key of the logged in user. This parameter is no longer required for this method on the new profile (api.new.facebook.com).
float	call_id	The request's sequence number. Each successive call for any session must use a sequence number greater than the last. We suggest using the current time in milliseconds, such as PHP's microtime(true) function.
string	sig	An MD5 hash of the current request and your secret key, as described in the authentication guide.
string	v	This must be set to 1.0 to use this version of the API.
string	format	Optional - desired response format. Either "XML" (default) or "JSON".
string	callback	Optional - wrap the response inside a function call. This is primarily to enable cross-domain javascript requests using the <script> tag, sometimes known as "JSONP". This works with both XML and JSON.
string	obj_type	Object's type. This is required, so that different object types may use the same hash keys for different objects.
string	key	Hash key (string object identifier) for locating the object.
string	prop_name	Name of the property to set.
integer	increment	Optional - Default is 1. Increments to add to current value, which is 0 if object was not found or created. Use negative number for decrements.

[edit] Return Value

32-bit integer: property's value after incremented.

[edit] PHP Client Coding Examples

[edit] FQL Equivalent

(none)

[edit] Error codes

Code	Description
1	An unknown error occurred. Please resubmit the request.
2	The service is not available at this time.
4	The application has reached the maximum number of requests allowed. More requests are allowed once the time window has completed.
5	The request came from a remote address not allowed by this application.
100	One of the parameters specified was missing or invalid.
101	The api key submitted is not associated with any known application.
102	The session key was improperly submitted or has reached its timeout. Direct the user to log in again to obtain another key.
103	The submitted call_id was not greater than the previous call_id for this session.
104	Incorrect signature.
200	Permission denied. Calling application or user doesn't have enough permissions to perform the action.
800	Internal error. Please report this to Facebook when getting this error.
801	Invalid operation error. This operation is not allowed.
802	Quota exceeded. Certain maximum number allocated for an application or a user is exceeded.
803	Requested object is not found on server.
805	A temporary database failure happened. Usually this can be corrected by a re-try.