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+Prefilters {#advanced.features.prefilters}
+==========
+
+Template prefilters are PHP functions that your templates are ran
+through *before they are compiled*. This is good for preprocessing your
+templates to remove unwanted comments, keeping an eye on what people are
+putting in their templates, etc.
+
+Prefilters can be either [registered](#api.register.filter) or loaded
+from the [plugins directory](#variable.plugins.dir) by using
+[`loadFilter()`](#api.load.filter) function or by setting the
+[`$autoload_filters`](#variable.autoload.filters) variable.
+
+Smarty will pass the template source code as the first argument, and
+expect the function to return the resulting template source code.
+
+This will remove all the html comments in the template source.
+
+
+    <?php
+    // put this in your application
+    function remove_dw_comments($tpl_source, Smarty_Internal_Template $template)
+    {
+        return preg_replace("/<!--#.*-->/U",'',$tpl_source);
+    }
+
+    // register the prefilter
+    $smarty->registerFilter('pre','remove_dw_comments');
+    $smarty->display('index.tpl');
+    ?>
+
+      
+
+See also [`registerFilter()`](#api.register.filter),
+[postfilters](#advanced.features.postfilters) and
+[`loadFilter()`](#api.load.filter).