registered or loaded from the plugins directory by using load_filter() function or by setting $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.

模板后过滤器是一些PHP函数，模板就是在那些函数编译后才运行。后过滤器同样能够通过 load filter() 函数和设置 $autoload filters 变量来注册或者从工具目录里载入。SMARTY将传递模板输出作为第一个参数，通过自定义函数返回处理结果。

 

Example 15-3. using a template postfilter <?php // put this in your application function add_header_comment($tpl_source, &$smarty) { return "<?php echo \"<!-- Created by Smarty! -->\n\" ?>\n".$tpl_source; } // register the postfilter $smarty->register_postfilter("add_header_comment"); $smarty->display("index.tpl"); ?> {* compiled Smarty template index.tpl *} <!-- Created by Smarty! --> {* rest of template content... *}