class MyClass extends Smarty - filemtime() fails

[kherge]

I'm extending the Smarty class and altering the way the fetch() method
retrieves templates.

The only alteration I make is to the cache_dir, compile_dir,
template_dir, and append a file extension to the template name.

public function fetch ( $a,
$b = null,
$c = null,
$d = null )
{
if ( $this->_root_dir === null )
$this->_root_dir = $this->template_dir;

$this->cache_dir = self::$TEMP
. $this->design
. MyClass::$DS
. 'cache'
. MyClass::$DS;

$this->compile_dir = self::$TEMP
. $this->design
. MyClass::$DS
. 'compile'
. MyClass::$DS;

$this->template_dir = $this->_root_dir
. $this->design
. MyClass::$DS;

$a .= self::EXT;

return parent::fetch( $a, $b, $c, $d );
}

When I use this in conjunction with a custom page block:

public function _platform_page ( $params, $content )
{
$old = $this->design;

if ( ! empty( $params['design'] ) )
$this->design = $params['design'];

$content = $this->fetch( 'header' )
. $content
. $this->fetch( 'footer' );
$this->design = $old;

return( $content );
}

The header fails to load with the following error message:

filemtime() [<a href='function.filemtime'>function.filemtime</a>]:
stat failed for .\templates\header.tpl

[Uwe.Tews]

I could not reproduce this problem.

Do you have some more details on the error message like line number
and call stack?

Which version of Smarty didyou use?