<?php
function php_self2url(){
   global $PHP_SELF;
   $tmp = eregi_replace("%2f","/",urlencode($PHP_SELF));
   return $tmp;
}
?>
<form action="<?php echo php_self2url();?>" method="post">
<p>What do you like :<select size="5" name="yourlike[]" multiple>
    <option value="sports">sports</option>
    <option value="pet">pet</option>
    <option value="violin">violin</option>
    <option value="sleep">sleep</option>
    <option value="music">music</option>
    <option value="eat">eat</option>
  </select></p>
  <input type="submit">
</form>
<?php
if(isset($yourlike)){
   $count = count($yourlike);
   echo "<h1>Your like is:<br>";
   for($i=0;$i<$count;$i++){
      echo "    " . $yourlike[$i]."<br>";
   }
}
?>