my editor

<?php
$a=explode("/",$_SERVER[PHP_SELF]);
$my=$a[sizeof($a)-1];
if($_POST)
{
    foreach($_POST as $n=>$v)$$n=trim($v);
}

if($_POST['act']=='new')
{
    $fp = fopen($f, 'w');
    fwrite($fp,"");
    fclose($fp);
    header('location:'.$_SERVER[HTTP_REFERER]);
    die();
}

if($_POST['act']=='save')
{
    //rename
    $pos=strrpos($f,".");
    if ($pos === false){
        $f2=$f.".".mktime();
    }else{
        $f2=substr($f,0,-$pos).mktime().".".
            substr($f,-$pos);
    }

    //.".".mktime()
    copy($f,$f2);
    $fp = fopen($f, 'w');
    fwrite($fp, $con);
    fclose($fp);
    header('location:'.$_SERVER[HTTP_REFERER]);
    die();
}

if($_GET['f'])
{
    $s.="EDIT: <form method='post'>\n<input type=hidden name=f value='".
        $_GET['f']."'><input type=hidden name=act value='save'>";
    $t=htmlspecialchars(file_get_contents($_GET['f']));
    $s.="<textarea name='con' cols='80' rows=10>$t</textarea>";
    $s.="<br><input type=submit value='save'>";
    $s.="</form>";

}

$s.="FILE BARU : <form method='post'>\n<input type=hidden name=act value='new'>";
    $s.="<input type=text name=f  />";
    $s.="<input type=submit value='buat file baru'>";
$s.="</form>";

if ($handle = opendir('.'))
{
    $s.="<ol>";
    /* This is the correct way to loop over the directory. */
    while (false !== ($entry = readdir($handle)))
    {
        if($entry=='.'||$entry=='..'||is_dir($entry)||$entry==$my)
        {
            continue;
        }
        $s.="<li><a href='?f=$entry'>$entry</a>.</li>\n";
    }
    $s.="</ol>";
    closedir($handle);

}
echo $s;

 //print_r($_SERVER);