SQL Server stored procedure error while executing from php

[Snake DX]

I am trying to execute a stored procedure from php.In the php code iam sending a integer parameter to the stored procedure\[code\]$orderId =824;$result =mssql_bind($sp, "@orderID", $orderId, SQLINT1, true, false);\[/code\]I getting an error mssql_execute() [function.mssql-execute]: message: The formal parameter "@orderID" was not declared as an OUTPUT parameter, but the actual parameter passed in requested output. (severity 16) Can any one say the reason please