The Business Mapping API by Facebook is useful for businesses that are operating several Facebook Apps and require the user ID to be the same between them. This is a common procedure for games studios that need to support cross platform or fraud detection. In these cases, businesses may require that the user's ID be identical between apps. The Business Mapping API has 3 main methods which can be used to map the same user across multiple apps.
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The Facebook PHP SDK by Neeraj Kumar functions as an extension of the official Facebook PHP SDK in order to ease development on particular tasks such as when a person likes a page. PHP 5.3+ is required.