Excel report php mysql

Good morning, I have the following program that makes me look up a mysql table and also generates a report in excel:

The problem is that when I want to make a report, it does it but in addition to the report table, it adds more things ..

As you can see, the table of the report that is what I need is the one that is shaded, but in addition to that table the document that I download comes with more things. HOW DO I MAKE ON THE EXCEL FILE ONLY THE REPORT TABLE APPEARS?

Next I attach the code

This is the index, here I include the php program that connects me to the database, the php that makes me search for a specific data hosted in the database and the php that I downloaded the report to excel, here are also the input, the submit that performs a certain search, the submit that I download the excel report and the table where the data I want is printed:

 <?php
 include('conex.php'); 
 ?>
 <?php
 include('repor.php');
 ?>
 <title>busqueda</title> 
 <p>
 <form name="form1" method="POST" action="busqueda.php" id="cdr" 
 onKeypress="if(event.keyCode == 13) event.returnValue = false;">
 <h2>Buscar Usuario</h2>
 <input name="busca" type="text" id="busqueda" placeholder="Ingrese el día">
 <input name="mes" type="text" id="mesqueda" placeholder="Ingrese el mes">
 <input name="año" type="text" id="añoqueda" placeholder="Ingrese el año">
 <br><br>
 <input type="submit" name="submit" value="Buscar"> 
 <input type="submit" name="reporte" value="Reporte">    
 </p>
 </form>

 <table width="500" border="1" id="tab">
 <tr>
    <td width="60">Día</td>
    <td width="90">Mes</td>
    <td width="90">Año</td>
 </tr>
 <?php
 include('busq.php');
 ?>
 </table>

This is the php that searches the database:

 <?php
 error_reporting(E_ALL ^ E_NOTICE);
 $busca=$_POST['busca'];
 $mes=$_POST['mes'];
 $año=$_POST['año'];

 $con->real_query("SELECT * FROM entrada WHERE dia like '%$busca%' and mes 
 LIKE '%$mes%' and anio like '%$año%'");
 $resultado= $con->use_result();

 while($muestra=$resultado->fetch_assoc()){
 echo'<tr>';
 echo'<td>'.$muestra['dia'].'</td>';
 echo'<td>'.$muestra['mes'].'</td>';
 echo'<td>'.$muestra['anio'].'</td>'; 
 echo'</tr>';
 }

 ?>

And this is the php that makes the report to excel, in this case I have it for me to make the report depending on what I write in the input day:

 <?php
 error_reporting(E_ALL ^ E_NOTICE);
 include('conex.php');
 $output='';
 $busca=$_POST['busca'];

 if(isset($_POST['reporte'])) {
 $sql = "SELECT * FROM  entrada where dia like '%$busca%'";
 $result= mysqli_query($con,$sql);
 if(mysqli_num_rows($result) > 0)
 {
    $output .= '
      <table class="table" bordered="1">
       <tr>
        <th>Dia</th>
        <th>Mes</th>
        <th>Anio</th>
       </tr>

    ';
    while ($row = mysqli_fetch_array($result)) {
        $output .= '
          <tr>
            <td>'.$row["dia"].'</td>
            <td>'.$row["mes"].'</td>
            <td>'.$row["anio"].'</td>
          </tr>  

        ';

    }
    $output .= '</table>';
    header("Content-Type: application/xls");
    header("Content-Disposition:attachment; filename=download.xls");
    echo $output;
 }

 }

 ?>

Any help will be very grateful!