oci_fetch_assoc it returns only the first row of the table

I am new to OCI and PHP and I am trying to print the data from an oracle table but I am getting an error. The error is that when printing the data of a table there is the oci_fetch_assoc function that only prints the first row of this table and I don’t really understand why. This is the code block where I try to print the data:

 <?php
    include("../controllers/conexion.php");
    $db_connection = oci_connect($db_esquema, $db_password, $db_instance);
    $stid = oci_parse($db_connection, 'SELECT * FROM PRODUCTOS ');
    oci_execute($stid);
                                  
    while ($fila = oci_fetch_assoc($stid)) {
         
         echo "<tr data-id=" . $fila['IDPRODUCTO'].">";
            echo "<td>". $fila['NOMBRE']."</td>";
            echo "<td>". $fila['PRECIO']."</td>";
            echo "<td>". $fila['DESCRIPCION']."</td>";
            echo "<td>"."<a href=".'"eliminarProducto.php?id='. $fila['IDPRODUCTO'].'" class="btn btn-danger" > <i class="fas fa-trash-alt"></i></a><a href="modificarProducto.php?id=' .$fila['IDPRODUCTO'].'" class="btn btn-secondary"><i class="fas fa-marker"></i></a></td>';
         echo "</tr>";
     }
   oci_free_statement($stid);                                        
   oci_close($db_connection);

   
 ?>

This is the output but, there is much more data in the table: