PHP Form Dropdown List from Array -

i have php page collects fileames folder , populates array array used create dropdown list. want submit value selected , display , thats stop. please help. in advance.

<?php // open directory     $mydirectory = opendir("media/mp3_para");  // each entry while($entryname = readdir($mydirectory)) { $dirarray[] = $entryname; }   // close directory      closedir($mydirectory);  //  count elements in array $indexcount = count($dirarray);   // sort 'em       sort($dirarray);  // create dropdown list  echo "<form method='post'  action='1.php' > " ; echo "change selection : " ;  echo "<select name='my_select'>"  ;  foreach($dirarray $index) {    // remove .  or .. list if (substr("$index", 0, 1) != ".") { $titlname1=$index ; $name1=substr($titlname1,0,-4) ; $titlname1=$name1 ;   echo '<option value="'.$index.'">'.$titlname1.'</option>' ;             }             }  echo '</select>';  echo "<input type='submit' class='navlinks' " ;  echo "</form>" ;  echo my_select ;  ?>  </body>