现在离职在家，突然发现没什么事儿做了，就研究研究了smarty，写了一个简单的搜索引擎。包含

assign赋值，display模版解析的方法，

新建一个MyTpl.class.php(其他名称也可以)

   代码如下:

    template_dir=rtrim($template_dir,'/').'/';        $this->compile_dir=rtrim($compile_dir,'/').'/';        $this->tpl_vars=array();    }                                                                                        //赋值函数    function assign($tpl_var,$value=null){        if ($tpl_var!='')   $this->tpl_vars[$tpl_var]=$value;    }                                                                                        //模版解析    function display($fileName){        $tplFile=$this->template_dir.$fileName;        if (!file_exists($tplFile))     return false;                                                                                                $comFileName=$this->compile_dir.'com_'.basename($tplFile).'.php';                                                                                                if (!file_exists($comFileName)||filemtime($comFileName)
    
     tpl_replace(file_get_contents($tplFile));            $handle=fopen($comFileName, 'w+');            fwrite($handle, $repContent);            fclose($handle);        }        require_once $comFileName;    }                                                                                        //模版替换函数    private function tpl_replace($content){        $pattern=array(                '/<\{\s*\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-xff]*)\s*\}>/i',     //解析变量                '/<\{\s*if\s*(.+?)\s*\}>(.+?)<\{\s*\/if\s*\}>/ies',                         //if标签解析                '/<\{\s*else\s*if\s*(.+?)\s*\}>/',                                                                //elseif解析                '/<\{\s*else\s*\}>/',                                                                                 //else解析                '/<\{\s*loop\s+\$(\S+)\s+\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\s*\}>(.+?)<\{\\s*\/loop\s*}>/is',     //匹配loop标签                '/<\{\s*loop\s+\$(\S+)\s+\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\s*=>\s*\$(\S+)\s*\}>(.+?)<\{\s*\/loop\s*\}>/is>/',//遍历loop中的键和值                '/<\{\s*include\s+[\"\']?(.+?)[\"\']?\s*\}>/ie',                          //匹配include        );        //替换成php        $replacement=array(                '
     tpl_vars["${1}"]?>',                //变量替换                '$this->stripvtags(\'
     \',\'${2}
     \')',                '$this->stripvtags(\'
     \',"")',                '
     ',                '
     tpl_vars["${1}"] as $this->tpl_vars["${2}"]) { ?>${3}
     ',                '
     tpl_vars["${1}"] as $this->tpl_vars["${2}"]=>$this->tpl_vars["${3}"]){?>$(4)
     ',                'file_get_contents($this->template_dir."${1}")'        );                                                                                                $repContent=preg_replace($pattern, $replacement, $content);        if (preg_match('/<\{([^(\}>)]{1,})\}>/', $repContent)){            $repContent=$this->tpl_replace($repContent);        }        return $repContent;    }    //替换条件语句中对应的值    private function stripvtags($expr,$statement){        $var_pattern='/\s*\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\s*/is';        $expr=preg_replace($var_pattern, '$this->tpl_vars["${1}"]', $expr);        $expr=str_replace("\\\"", "\"", $expr);        $statement=str_replace("\\\"", "\"", $statement);        return $expr.$statement;    }}
    

   以上很简单，就是赋值，然后做模版解析以后再输出，最复杂的一部分就是正则替换这一部分，写了很久，有时间还是借鉴一下smarty的吧。

   接下来就测试一下，新建一个inde.php

require_once 'plugins/MyTpl.class.php';$Tpl=new MyTpl();$title='第一个标题';$Tpl->assign('title',$title);$Tpl->display('index.tpl');

并且新建templates目录,templates_c目录其他根据实际情况来写,然后在templates中新建一个index.tpl，写上相应的代码，我只是做一个简单的测试，

            <{$title}>    

然后在浏览器中预览，就可以实现，我写的正则替换里，也包括一个loop的foreach替换标签。大家可以继续扩展完善，我也会继续完善一套自己的模版引擎。