PHP extends sqlsrv to call mssql stored procedure

$serverName = "127.0.0.1";
 $connectionInfo = array( "UID"=>"sa","PWD"=>"","Database"=>"test");
 $conn = sqlsrv_connect( $serverName, $connectionInfo);
 if( $conn === false )
 {
 echo "Could not connect.n";
 die( print_r( sqlsrv_errors(), true));
 }
 $spnumber = '10655****00';
 $chargenumber = '155****6789';

 //Parameters need to be assigned in the following array format and marked with types. SQLSRV_PARAM_IN is the input type, and SQLSRV_PARAM_OUT is the output type. Note that values ​​must be assigned in the order defined by the stored procedure
 $params = array(
 array(&$spnumber, SQLSRV_PARAM_IN),
 array(&$chargenumber, SQLSRV_PARAM_IN)
 );
 $tsql_callSP = "{call msgexpress_UnicomNewSubmit(?,?) }";
 $stmt3 = sqlsrv_query( $conn, $tsql_callSP, $params);
 if( $stmt3 === false )
 {
 echo "Error in executing statement 3.n";
 die( print_r( sqlsrv_errors( ), true));
 }