what wrong with my file?

hi,

wat i trying to do here is .. reading content from a file and disply it.
and then get some input from the user and save it into file and display it.

this is the format of my record.txt

web1, www.web1.com // <--- one set of data
web2, www.web2.com 

my problem with my code is that...
i can't get my prog to write one set of data written line by line (one set of data per line)
but all my data will b written on one line even thought i have assigned "\n" to the back of my every set of data.

another prob
while using $_POST
whenever, i 'refresh' the screen, the data that has been post once (from submit-button), will b re-post again.
how can i prevent this from happening?


this is my code.

<?php

$my_array = localtime(time(), 1);
$month = $my_array["tm_mon"] + 1 ;
$day = $my_array["tm_mday"] ;
$year = $my_array["tm_year"] +1900 ;
$dayOfWeek = $my_array["tm_wday"] ;
$weekdays = array("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday") ;


echo "<h3>Current Time : $month-$day-$year > $weekdays[$dayOfWeek]<br></h3>" ;




// READ LINE

$fs = fopen( 'C:\Program Files\EasyPHP1-7\www\url\record.txt', 'r' );
//$fd = fopen( 'filedestination', 'w' );

while( ! feof( $fs ) )
{
      $tmp = fgets( $fs );

      # replace this line with whatever you want to do to each line
      //$tmp = process_line( $tmp );
      
      $process = explode(",", $tmp);
      echo "<a href = \"$process[1]\"> $process[0]</a> <br>";

      //fputs( $fd, $tmp );
}

//fclose( $fd );
fclose( $fs );

echo "<br>";



echo "<FORM ACTION=\"url.php\" METHOD=POST>";

echo " Comment <br>";
echo "<input type=text name = \"comment\" size=\"25\" ><br>";
echo " Address <br>";
echo "<input type=text name = \"url_address\" size=\"25\" ><br>";
echo "<INPUT TYPE=submit NAME=submit_button VALUE=\"Submit\">";
echo "</FORM>";

echo " -----------------<br>";

$tmp_comment = "";
$tmp_url_address = "";
$tmp_comment = $_POST["comment"];
$tmp_url_address = $_POST["url_address"];

$fd = fopen( 'C:\Program Files\EasyPHP1-7\www\url\record.txt', 'a' );

$write_out = $tmp_comment.",".$tmp_url_address;

fwrite ($fd, "\n$write_out\n");

fclose( $fd );

?>