WHILE gescheiden met een komma..?

<?
$select1 = mysql_query(" SELECT * FROM database ORDER BY id")or die(mysql_error());
while($obj1 = mysql_fetch_object($select1)) {

echo "". $obj1->naam .", "; 
}
?>

<?
$select1 = mysql_query(" SELECT * FROM database ORDER BY id")or die(mysql_error());
while($obj1 = mysql_fetch_object($select1)) {
 
echo "". $obj1->naam .", "; 
}
?>

<?php
  $string = $null;
  $select1 = mysql_query(" SELECT * FROM database ORDER BY id")or die(mysql_error());
  while($obj1 = mysql_fetch_object($select1)) {
    $string =  $string.', '.$obj1->naam;
  }
  echo rtrim($string ,",");
?>

<?php
  $string = $null;
  $select1 = mysql_query(" SELECT * FROM database ORDER BY id")or die(mysql_error());
  while($obj1 = mysql_fetch_object($select1)) {
    $string =  $string.', '.$obj1->naam;
  }
  echo rtrim($string ,",");
?>

<?php
$output = array();
$select1 = mysql_query("SELECT * FROM database ORDER BY id") or die(mysql_error());
while($obj1 = mysql_fetch_assoc($select1)) {
    $output[] = $obj1['naam'];
}
echo implode(', ', $output);

<?php
$output = array();
$select1 = mysql_query("SELECT * FROM database ORDER BY id") or die(mysql_error());
while($obj1 = mysql_fetch_assoc($select1)) {
    $output[] = $obj1['naam'];
}
echo implode(', ', $output);