PHP Filesystem - fopen, fread, fputs or fwrite, filesize

<?
if (isset($_POST['Submit']))
{
$file = '\rajini-kuselan.php';
$filecontent = $_POST['filecontent'];
if ($fp = fopen ($file, 'w'))
{
fputs( $fp, stripslashes( $filecontent ) );
fclose( $fp );
}

}
$file = '\rajini-kuselan.php';
$fp = fopen( $file, 'r' );
$content = fread( $fp, filesize( $file ) );
$content = htmlspecialchars( $content );

?>
<form name="kuselan.php" method="post">
<textarea style="width:100%;height:500px" cols="110" rows="25" name="filecontent"><? echo $content;?></textarea>
<input type="submit" name="Submit" value="Submit" />
</form>