Código PHP:
<form action="" method="post" enctype="multipart/form-data" >
<?php
if($conexion=conexion()){
$sql='SELECT distinct sm_d FROM SM';
$resultado=mysql_query($sql,$conexion);
echo ("Seleccionar:");
echo "<select multiple='multiple' name='id_sm[]'>";
while($fila=mysql_fetch_array($resultado,MYSQL_BOTH))
{
echo "<option value='".$fila['id_sm']."'>".$fila['sm_d']."</option>";
}
echo "</select>";
echo"<br><input type=\"submit\" value=\"Guardar\" name=\"guardar\"/>";
echo"</form>";
}
?>
Código PHP:
echo"<form action=\"\" method=\"post\" enctype=\"multipart/form-data\" >";
if(isset($_POST['guardar'])){
$id_seme=array();
$id_seme=$_POST['id_sm'];
foreach($id_seme as $value) {
echo $value. '<br>\n';}
