como hacer un selcet multiple ?

[p2pdownloading]

hola estoy haciendo un forma para enviar subir infor a la BD, una de las opciones son los idiomas, por lo que necesito enviar una cadena de este estilo

en,es,it,pt

como hago para ir creando la secuencia anterior a partir de el select ???

saludos y gracias

Código PHP:

  <select name="dm_idioma">
 
                            <option value="it"  >Italian</option>
                            <option value="ko"  >Korean</option>
 
                            <option value="zh-CN"  >Chinese (Simplified)</option>
                            <option value="zh-TW"  >Chinese (Traditional)</option>
                            <option value="pt"  >Portuguese</option>
                            <option value="en"  selected>English</option>
 
                            <option value="de"  >German</option>
                            <option value="fr"  >French</option>
 
                            <option value="es"  >Spanish</option>
                            <option value="ja"  >Japanese</option>
                            <option value="ar"  >Arabic</option>
                            <option value="ru"  >Russian</option>
 
                            <option value="el"  >Greek</option>
                            <option value="nl"  >Dutch</option>
 
                            <option value="bg"  >Bulgarian</option>
                            <option value="cs"  >Czech</option>
                            <option value="hr"  >Croatian</option>
                            <option value="da"  >Danish</option>
 
                            <option value="fi"  >Finnish</option>
                            <option value="hi"  >Hindi</option>
 
                            <option value="pl"  >Polish</option>
                            <option value="ro"  >Romanian</option>
                            <option value="sv"  >Swedish</option>
                            <option value="no"  >Norwegian</option>
 
                            <option value="ca"  >Catalan</option>
                            <option value="tl"  >Filipino</option>
 
                            <option value="iw"  >Hebrew</option>
                            <option value="id"  >Indonesian</option>
                            <option value="lv"  >Latvian</option>
                            <option value="lt"  >Lithuanian</option>
 
                            <option value="sr"  >Serbian</option>
                            <option value="sk"  >Slovak</option>
 
                            <option value="sl"  >Slovenian</option>
                            <option value="uk"  >Ukrainian</option>
                            <option value="vi"  >Vietnamese</option>
                          </select> 
   

[David]

¿Qué lenguaje estás usando en el servidor?, porque puedes simplemente hacer un select múltiple como tal (multiple="multiple"), después, obtener los datos y formar la cadena en el servidor.

[p2pdownloading]

hola ya eh podido lograrlo,

Código PHP:

  <select name="dm_idioma[]" multiple style="height: 200px;">
 
                            <option value="it"  >Italian</option>
                            <option value="ko"  >Korean</option>
                            <option value="zh-CN"  >Chinese (Simplified)</option>
                            <option value="zh-TW"  >Chinese (Traditional)</option>
                            <option value="pt"  >Portuguese</option>
                            <option value="en"  selected>English</option>
 
                            <option value="de"  >German</option>
                            <option value="fr"  >French</option>
                            <option value="es"  >Spanish</option>
                            <option value="ja"  >Japanese</option>
                            <option value="ar"  >Arabic</option>
                            <option value="ru"  >Russian</option>
 
                            <option value="el"  >Greek</option>
                            <option value="nl"  >Dutch</option>
                            <option value="bg"  >Bulgarian</option>
                            <option value="cs"  >Czech</option>
                            <option value="hr"  >Croatian</option>
                            <option value="da"  >Danish</option>
 
                            <option value="fi"  >Finnish</option>
                            <option value="hi"  >Hindi</option>
                            <option value="pl"  >Polish</option>
                            <option value="ro"  >Romanian</option>
                            <option value="sv"  >Swedish</option>
                            <option value="no"  >Norwegian</option>
 
                            <option value="ca"  >Catalan</option>
                            <option value="tl"  >Filipino</option>
                            <option value="iw"  >Hebrew</option>
                            <option value="id"  >Indonesian</option>
                            <option value="lv"  >Latvian</option>
                            <option value="lt"  >Lithuanian</option>
 
                            <option value="sr"  >Serbian</option>
                            <option value="sk"  >Slovak</option>
                            <option value="sl"  >Slovenian</option>
                            <option value="uk"  >Ukrainian</option>
                            <option value="vi"  >Vietnamese</option>
                            
                          </select> 
   

Código PHP:

  foreach ($_POST['dm_idioma'] as $idioma){$dm_idioma .= $idioma.',';} 
   

gracias de todos modos