function bd_alumno_datos_todos(){
$sql = "SELECT
           cedu_alum, carr_id, seme_id, pera_id, peri_id, capa_id
        FROM
            alumno
        ORDER BY cedu_alum ASC";

$datos = sql2array( $sql );

return $datos;
}

<?php include 'conexion.php'; $alumno= bd_alumno_datos_todos(); <h2>Listado de Alumnos</h2> <table>     <thead>             <tr>
        <th><center>Cédula</th>
        <th><center>Carrera</th>
        <th><center>Semestre</th>
        <th><center>Período</th>
         <th><center>Capacitado</th>
         <th><center>Opciones</th>
    </tr>
</thead>

<tbody>




    <?php foreach ($alumno as $alumno_temp): ?><tr>

        <td><?=$alumno_temp['cedu_alum']?></td>

         <td> <?= $alumno_temp['carr_id'];?></td>

        <td><?=$alumno_temp['seme_id']?></td>
        <td>
        <?=$alumno_temp['pera_id']?>
        <td>