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Postfilters {#advanced.features.postfilters}
===========
Template postfilters are PHP functions that your templates are ran
through *after they are compiled*. Postfilters can be either
[registered](#api.register.filter) or loaded from the [plugins
directory](#variable.plugins.dir) by using the
[`loadFilter()`](#api.load.filter) function or by setting the
[`$autoload_filters`](#variable.autoload.filters) variable. Smarty will
pass the compiled template code as the first argument, and expect the
function to return the result of the processing.
<?php
// put this in your application
function add_header_comment($tpl_source, Smarty_Internal_Template $template)
{
return "<?php echo \"<!-- Created by Smarty! -->\n\"; ?>\n".$tpl_source;
}
// register the postfilter
$smarty->registerFilter('post','add_header_comment');
$smarty->display('index.tpl');
?>
The postfilter above will make the compiled Smarty template `index.tpl`
look like:
<!-- Created by Smarty! -->
{* rest of template content... *}
See also [`registerFilter()`](#api.register.filter),
[prefilters](#advanced.features.prefilters),
[outputfilters](#advanced.features.outputfilters), and
[`loadFilter()`](#api.load.filter).
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