How can I unload or disallow smarty core plugins from a template when using $smarty->fetch('mytemplate.tpl') method
For example the template mytemplate.tpl contains {html_options} and {html_table}
When using $smarty->fetch('mytemplate.tpl') only the {html_options} should be parsed by smarty, but {html_table} not
removing the function.html_table.php from plugin folder is not an option as it is still in use by another $smarty->fetch() call
A possible solutions is to extend from the Smarty_Security class and enable securty by using the method
$smarty->enableSecurity($instanceOfClass)
Once the fetch method has been called , disableSecurity method do the trick to reenable all plugins/tags/modifiers again.
Unfortunately when enableSecurity is used and forbidden functions are used an Exception is thrown
An alternative is to replace all tags/variables/... you want to disallow with {literal}{forbiddenTags}{/literal} by using preg_replace before calling $smarty->fetch([...])
Example
# negate regular expression pattern to allow only the below tags
$pattern = "/\{(?!allowedTag1|allowedTag2).*?\}/";
$replacement = '{literal}$0{/literal}';
$content = preg_replace($pattern, $replacement, $content);
$smarty->fetch("string:" . $content);
More details about the Security class here: http://www.smarty.net/docs/en/advanced.features.tpl
