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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).