PHP - no se ejecuta esta consulta sql

if(mysql_num_rows($conexion->query("SELECT id FROM `tabla` WHERE id=4132"))==0){

        echo "SI existe";

    }else{

        echo "NO existe, lo agrego";

    }

if($conexion->query("SELECT id FROM `tabla` WHERE id=4132")){

    echo "Si";

else

    echo "NO";

if(mysqli_num_rows($conexion->query("SELECT id FROM tabla WHERE id=4132

"))==TRUE){

        echo "EXISTE";

    }else{

        echo "NO EXISTE";

    }