Nanyang Municipal Party Committee Secretary Message Board A paging text-based PHP message board source code Page 1/2

I'm new to PHP and I programmed a message board program. I feel good about myself, so I shamelessly posted it and asked for your corrections. The source program is as follows:
//File name: guest.php
//Setting section
$guestfile="guest";//Text file to record comments
$home="index.html";/ /Return to the homepage
$imagedir="image"; //Directory of image files
$backimage=$imagedir."/bk.gif";//Background image
$backcolor="#ceffff";//Background color, Works when $backimage=""
?>


if($QUERY_STRING!="") {
$page = $QUERY_STRING;
} else {
$page = 1;
}
if($mode=="add"){
$name=htmlspecialchars(trim($name));
$title=htmlspecialchars(trim($title));
$data= nl2br(htmlspecialchars($data));
$data=str_replace("r","",$data);
$data=str_replace("x0A","",$data);
$data=str_replace(" "," ",$data);
if($data=="") $data=" ";
$e_mail=trim($e_mail);
if($e_mail=="") $e_mail=0;
$url=trim($url);
if($url=="http://" || $url=="") $url=0;
$time=date("Y")."Year ".date("m")."month".date("d")."日[".date("H").":".date("i").":".date(" s")."]";
if($name=="" || $title==""){
echo "n";
exit;
}
$adddata=$name."t".$e_mail."t".$url."t".$title."t".$data."t".$icon."t".$time." n";
if(file_exists($guestfile)){
$filebuffer=file($guestfile);
if(sizeof($filebuffer)>100){
for($i=0;$i<100;$ i++)
           $newbuffer[i]=$filebuffer[i];                                                                                                                     fputs($fp,$ adddata);
fclose($fp);
$buffer=implode("",$newbuffer);
$fp=fopen($guestfile,"a");
fputs($fp,$buffer);
fclose( $fp);
}
else{
$fp=fopen($guestfile,"w");
fwrite($fp,$adddata);
fclose($fp);
}
? >
< ;meta HTTP-EQUIV="Content-Type" C/1.gif"; ?>" width="15" height="15">
 
" width="15" height="15">

                                                                                                                                                                                    " height="15">
                                                                                                                                                     ?>" width="15" height="15">

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