<?php

        $pdo = $dbconn->prepare("SELECT u_matricula FROM usuario ORDER BY u_tipo_esp LIMIT 1");
        $pdo->execute();
        $users = $pdo->fetchAll();
        foreach($users as $matriculas)
        {
          echo '<input type= "text" value"'.$matriculas['u_matricula'].'">';
        }
        ?>
        </select>
        </div>