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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).