Convert C# to php

I need this code converted to php public string GetRequestChecksum(string secretKey, string merchantID, string transactionType, long amount, string currency, string merchantReference, string userID) { var checksumString = [login to view URL]("{0}|{1}|{2}|{3}|{4}|{5}", secretKey, merchantID, transactionType, amount, currency, merchantReference); if () checksumString += '|' + userID; SHA256Managed sha = new SHA256Managed(); //[login to view URL] = [login to view URL]([login to view URL]([login to view URL](checksumString)).Select(h => [login to view URL]("X2")).Aggregate((i, j) => i + j), checksum, [login to view URL]).ToString(); return [login to view URL]([login to view URL](checksumString)).Select(h => [login to view URL]("X2")).Aggregate((i, j) => i + j); } Must produce same result as C# when running in my php plug-in. Sample data for above values is here below: SecretKey: DB3EEEFA-0324-4130-B259-7F43508FBB06 MerchantReference: ESC01UAT1512751543 MerchantID: E33F4561-23EA-431F-A0F6-DD0D62D06B90 TransactionType: Payment Amount: 259900 Currency: ZAR Checksum: BC031D95BF292C65F56B628CD2B7812A2C79A8F6448D2B7A78A3B90E6252F842 To verify that code has been generated correctly here is C#: [login to view URL] = [login to view URL]([login to view URL]([login to view URL](checksumString)).Select(h => [login to view URL]("X2")).Aggregate((i, j) => i + j), checksum, [login to view URL]).ToString();