public function _include_once($file)
{
if ($file instanceof SandboxedString) {
$file = strval($file);
}
if (!in_array($file, $this->_get_included_files())) {
$code = @file_get_contents($file, true);
if ($code === false) {
trigger_error("include_once('" . $file . "') [function.include-once]: failed to open stream. No such file or directory", E_USER_WARNING);
return false;
}
$this->includes[] = $file;
return $this->execute($code);
}
return null;
}