PHP Sql Server Output Parameter gives error

I have created a stored procedure with a few input parameters and an output parameter. When I am trying to call it from PHP gives me an error. My code is as below :

$ID = 0;
$sql = "exec Apprasial_Details_Insert 
        @Employee_Name = '".$_POST["Emp_Name"]."',
        @Position = '".$_POST["Position"]."',
        @Dept_Branch = '".$_POST["Branch"]."',
        @Location = '".$_POST["Location"]."',
        @Appraiser_Name_1 = '".$_POST["1Appraiser"]."',
        @Appraiser_Name_2 = '".$_POST["2Appraiser"]."',
        @Title_1 = '".$_POST["1AppraiserTitle"]."',
        @Title_2 = '".$_POST["2AppraiserTitle"]."',
        @Date = '$datetime_formatted',
        @Grand_Total = '".$_POST["GrandTotal"]."',
        @Staff_ID = '".$_POST["Staff_ID"]."'
        @new_identity = $ID";
$procedure_params = array
(
    array(&$ID['new_identity'], SQLSRV_PARAM_OUT,SQLSRV_PHPTYPE_INT)
);      
$stmt = sqlsrv_query( $conn, $sql,$procedure_params);
if( $stmt === false ) 
{
    //header("Location: error.php?id=$statement"); 
    die( print_r( sqlsrv_errors(), true));
}

The error I get :

Array ( [0] => Array ( [0] => 42000 [SQLSTATE] => 42000 1 => 102 [code] => 102 2 => [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Incorrect syntax near '@new_identity'. [message] => [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Incorrect syntax near '@new_identity'. ) )

If I change my code to :

$sql = "exec Apprasial_Details_Insert 
        @Employee_Name = '".$_POST["Emp_Name"]."',
        @Position = '".$_POST["Position"]."',
        @Dept_Branch = '".$_POST["Branch"]."',
        @Location = '".$_POST["Location"]."',
        @Appraiser_Name_1 = '".$_POST["1Appraiser"]."',
        @Appraiser_Name_2 = '".$_POST["2Appraiser"]."',
        @Title_1 = '".$_POST["1AppraiserTitle"]."',
        @Title_2 = '".$_POST["2AppraiserTitle"]."',
        @Date = '$datetime_formatted',
        @Grand_Total = '".$_POST["GrandTotal"]."',
        @Staff_ID = '".$_POST["Staff_ID"]."'
        @new_identity = ?";
$procedure_params = array
(
    array(&$ID['new_identity'], SQLSRV_PARAM_OUT)
);      
$stmt = sqlsrv_query( $conn, $sql,$procedure_params);
if( $stmt === false ) 
{
    //header("Location: error.php?id=$statement"); 
    die( print_r( sqlsrv_errors(), true));
}

The error I get :

Array ( [0] => Array ( [0] => IMSSP [SQLSTATE] => IMSSP 1 => -7 [code] => -7 2 => An invalid PHP type was specified as an output parameter. DateTime objects, NULL values, and streams cannot be specified as output parameters. [message] => An invalid PHP type was specified as an output parameter. DateTime objects, NULL values, and streams cannot be specified as output parameters. ) )

I refered to the posts below :

Link 1 Link 2

Where have I gone wrong? Appreciate any suggestion / help