<?php
$servername = "localhost";
$username = "root";
$password = "vertrigo";
$dbname = "db";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

function an($hora){
global $conn;
$dia = date("d");
$mes = date("m");
$ano = date("Y");
$sql = "SELECT * from argenda where hora='$hora' && dia='$dia' && mes='$mes' && ano='$ano' "; // id,hora,dia,mes,ano
$result = $conn->query($sql);
if($result->num_rows == 0){
    return "Disponivel";
} else{
    return "Locado";
}
}
?>
<table align="center" class="table" id="panel-hoje-tarde" name="panel-hoje-tarde">
        <thead>
          <tr>
            <th>Horário</th>
            <th>Status</th>
            <th>Marcar</th>
          </tr>
        </thead>
        <tbody>
          <tr class="danger">
            <td>13:30</td>
            <td><?php echo an("13:30");?></td>
            <td><button type="button" name="1330" id="1330" class="btn btn-danger" disabled="disabled">Marcar horário</button></td>

          </tr>
          <tr class="success">
            <td>14:00</td>
            <td><?php echo an("14:00");?></td>
            <td><button type="button" name="1400" id="1400" class="btn btn-success">Marcar horário</button></td>

          </tr>
          <tr class="success">
            <td>14:30</td>
            <td><?php echo an("14:30");?></td>
            <td><button type="button" name="1430" id="1430" class="btn btn-success">Marcar horário</button></td>

          </tr>
          <tr class="success">
            <td>15:00</td>
            <td><?php echo an("15:00");?></td>
            <td><button type="button" name="1500" id="1500" class="btn btn-success">Marcar horário</button></td>

          </tr>
          <tr class="danger">
            <td>15:30</td>
            <td><?php echo an("15:30");?></td>
            <td><button type="button" name="1530" id="1530" class="btn btn-danger" disabled="disabled">Marcar horário</button></td>

          </tr>
          <tr class="success">
            <td>16:00</td>
            <td><?php echo an("16:00");?></td>
            <td> <button type="button" name="1600" id="1600" class="btn btn-success">Marcar horário</button></td>

          </tr>
          <tr class="danger">
            <td>16:30</td>
            <td><?php echo an("16:30");?></td>
            <td> <button type="button" name="1630" id="1630" class="btn btn-danger" disabled="disabled">Marcar horário</button></td>

          </tr>
          <tr class="danger">
            <td>17:00</td>
            <td><?php echo an("17:00");?></td>
            <td> <button type="button" name="1700" id="1700" class="btn btn-danger" disabled="disabled">Marcar horário</button></td>

          </tr>
          <tr class="success">
            <td>17:30</td>
            <td><?php echo an("17:30");?></td>
            <td> <button type="button" name="1730" id="1730" class="btn btn-success">Marcar horário</button></td>

          </tr>
          <tr class="danger">
            <td>18:00</td>
            <td><?php echo an("18:00");?></td>
            <td>                <button type="button" name="1800" id="1800" class="btn btn-danger" disabled="disabled">Marcar horário</button></td>

          </tr>

        </tbody>
      </table>