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alterar valor sessão


zipzap

Question

Eu tenho o seguinte código:

<form method="post" action="" target="self">
      <table>
        <tr>
                        <td><span id="qualquer"></span></td>
               <td align="center"><input name="Buy" type="submit" value="Buy" ></td>
               <td align="center"><input name="Cancel" type="submit" value="Cancel"></td>
           </tr>
      </table>
  </form>

O que eu quero fazer é quando clicar no botão cancel alterar 2 valores em 2 variáveis de sessão.Como fazer?

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<?php session_start();

$_SESSION['Buy'] = $_POST['Buy'];
$_SESSION['Cancel'] = $_POST['Cancel'];
?>
<form method="post" action="" target="self">
      <table>
        <tr>
                        <td><span id="qualquer"></span></td>
               <td align="center"><input name="Buy" type="submit" value="Buy" ></td>
               <td align="center"><input name="Cancel" type="submit" value="Cancel"></td>
           </tr>
      </table>
  </form>

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