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+Prefilters/Postfilters {#plugins.prefilters.postfilters}
+======================
+
+Prefilter and postfilter plugins are very similar in concept; where they
+differ is in the execution \-- more precisely the time of their
+execution.
+
+string
+
+smarty\_prefilter\_
+
+name
+
+string
+
+\$source
+
+object
+
+\$template
+
+Prefilters are used to process the source of the template immediately
+before compilation. The first parameter to the prefilter function is the
+template source, possibly modified by some other prefilters. The plugin
+is supposed to return the modified source. Note that this source is not
+saved anywhere, it is only used for compilation.
+
+string
+
+smarty\_postfilter\_
+
+name
+
+string
+
+\$compiled
+
+object
+
+\$template
+
+Postfilters are used to process the compiled output of the template (the
+PHP code) immediately after the compilation is done but before the
+compiled template is saved to the filesystem. The first parameter to the
+postfilter function is the compiled template code, possibly modified by
+other postfilters. The plugin is supposed to return the modified version
+of this code.
+
+
+    <?php
+    /*
+     * Smarty plugin
+     * -------------------------------------------------------------
+     * File:     prefilter.pre01.php
+     * Type:     prefilter
+     * Name:     pre01
+     * Purpose:  Convert html tags to be lowercase.
+     * -------------------------------------------------------------
+     */
+     function smarty_prefilter_pre01($source, Smarty_Internal_Template $template)
+     {
+         return preg_replace('!<(\w+)[^>]+>!e', 'strtolower("$1")', $source);
+     }
+    ?>
+
+         
+
+
+    <?php
+    /*
+     * Smarty plugin
+     * -------------------------------------------------------------
+     * File:     postfilter.post01.php
+     * Type:     postfilter
+     * Name:     post01
+     * Purpose:  Output code that lists all current template vars.
+     * -------------------------------------------------------------
+     */
+     function smarty_postfilter_post01($compiled, Smarty_Internal_Template $template)
+     {
+         $compiled = "<pre>\n<?php print_r(\$template->getTemplateVars()); ?>\n</pre>" . $compiled;
+         return $compiled;
+     }
+    ?>
+
+         
+
+See also [`registerFilter()`](#api.register.filter) and
+[`unregisterFilter()`](#api.unregister.filter).