how to use loadFilter() ?

[KarelWintersky]

https://www.smarty.net/docs/en/api.load.filter.tpl

But:

$smarty->loadFilter(Smarty::FILTER_OUTPUT, "htmlentities");

throws:

SmartyException: outputfilter 'htmlentities' not found or callable

$smarty->registerPlugin(Smarty::PLUGIN_FUNCTION, 'htmlentities', 'htmlentities');
$smarty->loadFilter(Smarty::FILTER_OUTPUT, "htmlentities");

Produces same result for all and any plugin type.

P.S. I need auto escape of string variables, like:

<textarea>{$history|htmlentities}</textarea>

without unnecessary calls, since there are a lot of output fields and unnecessary calls clutter the code.

[KarelWintersky]

Upd: Alone

$smarty->registerFilter(Smarty::FILTER_OUTPUT, "htmlentities");

produces:

1/1 TypeError

htmlentities(): Argument #2 ($flags) must be of type int, Smarty_Internal_Template given

in ..../vendor/smarty/smarty/libs/sysplugins/smarty_internal_runtime_filterhandler.php on line 63

But

$smarty->registerFilter(Smarty::FILTER_OUTPUT, "htmlentities");
$smarty->loadFilter(Smarty::FILTER_OUTPUT, "htmlentities");

produces same result:

1/1 SmartyException

outputfilter 'htmlentities' not found or callable

in ..../vendor/smarty/smarty/libs/sysplugins/smarty_internal_method_loadfilter.php on line 61

Also, https://www.smarty.net/docs/en/advanced.features.outputfilters.tpl return 500 server error.

[KarelWintersky]

Solved via:

$smarty->setEscapeHtml(true); 
// or
$smarty->escape_html = true

but...

[wisskid]

You found the answer! You cannot load a filter using a unregistered function, which is what caused the first error. But for your usecase auto-escape is better anyway.

[KarelWintersky]

What about other output filters? For example, function that translates output to other language?

How to use it?

How to register function and use it for output filter?

[wisskid]

Please see the Smarty 5 documentation on this topic when using Smarty 5: https://smarty-php.github.io/smarty/5.x/api/filters/output-filters/