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<form method="post" action="">
     <textarea name="flist" cols="40" rows="2"  wrap="OFF" style="width:98%"></textarea>
     <input type="submit">
</form>
<?php
$list = '';
$flist = (isset($_POST['flist'])) ? $_POST['flist'] : '';
$flist = explode("\n",$flist);
for($i=0 ; $i<count($flist) ; $i++)
{
     if ($list == '')
               {
                    $list = $flist[$i];
               }
               else
               {
                    if(!empty($flist[$i])){
                         $list = $list . ',' . $flist[$i];
                    }
               }
}
echo $list;
?>

<form method="post" action=""> <textarea name="flist" cols="40" rows="2" wrap="OFF" style="width:98%"></textarea> <input type="submit"> </form> <?php $list = ''; $flist = (isset($_POST['flist'])) ? $_POST['flist'] : ''; $flist = explode("\n",$flist); for($i=0 ; $i<count($flist) ; $i++) { if ($list == '') { $list = $flist[$i]; } else { if(!empty($flist[$i])){ $list = $list . ',' . $flist[$i]; } } } echo $list; ?>

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$flist = explode("\r\n",$flist);

$flist = explode("\r\n",$flist);