读取、把模板中的标签解析成PHP语法编译成PHP文件

[PHP]代码   

class Templates{  
    /*获取站点根目录*/  
    var $web_root;  
    /*模板目录*/  
    var $templates_dir;  
    /*编译目录*/  
    var $compile_dir;  
    /*通过它判断读取的是前台模板还是后台模板*/  
    var $templates_postion;  
    /*临时存储模板文件内容*/  
    var $out_put_content;  
    /*临时数组*/  
    var $_array=array();  
    var $left_tag='[';  
    var $right_tag=']';  
    /* 
    *其它类对象 
    */  
    var $class_obj;  
    /* 
    *构造函数初始化数据 
    */  
    function __construct($v)  
    {  
        $this->web_root=$_SERVER['DOCUMENT_ROOT'].'/';  
        $this->templates_postion=$v;  
    }  
    /* 
    读取XML文件获取相应的模板与编译的目录地址 
    */  
    function read_site_config_xml()  
    {  
        /* 
        定义读取XML 
        $xml_dom; 
        */  
        $xml_dom=simplexml_load_file($this->web_root.'web.config.xml');  
        $this->compile_dir=$this->web_root.$xml_dom->compileConfig->dir;  
        switch($this->templates_postion)  
        {  
            case 'front':  
            $this->templates_dir=$this->web_root.$xml_dom->templatesConfig->templatesDir;  
            break;  
            case 'admin':  
            $this->templates_dir=$this->web_root.$xml_dom->templatesConfig->adminTemplatesDir;  
            $this->compile_dir.='admin/';  
            break;  
        }  
        unset($xml_dom);  
    }  
    /* 
    读取模板文件 
    */  
    function read_template($templatename)  
    {  
        $this->read_site_config_xml();  
        return file_get_contents($this->templates_dir.$templatename);  
    }  
    /* 
    注册模板变量 
    */  
    function assign($tag,$tagvalue=null)  
    {  
        if(is_array($tag))  
        {  
            foreach($tag as $tagkey=>$tagkeyvalue)  
            {  
                $this->_array[$tagkey]=$tagkeyvalue;  
            }  
        }  
        else  
        {  
            $this->_array[$tag]=$tagvalue;  
        }  
    }  
    /* 
    向模板中赋值 
    */  
    function assgin_value()  
    {  
        foreach($this->_array as $tag=>$tagvalue)  
        {  
                $this->out_put_content=str_replace($this->left_tag.$tag.$this->right_tag,'$this->_array[\''.$tag.'\']',$this->out_put_content);  
        }  
    }  
    /* 
    输出模板文件 
    */  
    function out_put($templatename)  
    {  
        //先检查此文件是否已编译，如果编译则直接输出  
        if($this->check_compile($templatename))  
        {  
            echo $this->out_put_content;  
        }  
        else  
        {  
            $this->out_put_content=$this->read_template($templatename);  
            $this->convert_php_tag();  
            $this->assgin_value();  
            $this->make_compile($templatename);  
            echo $this->out_put_content;  
        }  
    }  
    /* 
    编译模板 
    */  
    function make_compile($compilename)  
    {  
        $name=$this->compile_dir.$compilename.'.php';  
        file_put_contents($name,$this->out_put_content,LOCK_EX);  
        ob_start();  
        include($name);  
        $this->out_put_content=ob_get_contents();  
        ob_end_clean();       
    }  
    /* 
    检查编译 
    */  
    function check_compile($compilename)  
    {  
        $this->read_site_config_xml();  
        $name=$this->compile_dir.$compilename.'.php';  
        if(file_exists($name))  
        {  
            ob_start();  
            include($name);  
            $this->out_put_content=ob_get_contents();  
            ob_end_clean();  
            $returnvalue=true;  
        }  
        else  
        {  
            $returnvalue=false;  
        }  
        return $returnvalue;  
    }  
    /* 
    处理模板文件中PHP语法 
    */  
    function convert_php_tag()  
    {  
        $html_file_tag=array  
        (  
            /*结构控制语句开始、结束标签*/  
            &#39;<{foreach&#39; => &#39;<?php foreach&#39;,  
            &#39;<{if&#39; => &#39;<?php if&#39;,  
            &#39;<{for&#39;=>&#39;<?php for&#39;,  
            &#39;:}>&#39;=>&#39;: ?>&#39;,  
            &#39;<{/if}>&#39;=>&#39;<?php endif; ?>&#39;,  
            &#39;<{/else}>&#39;=>&#39;<?php else: ?>&#39;,  
            &#39;<{/foreach}>&#39;=>&#39;<?php endforeach; ?>&#39;,  
            &#39;<{/for}>&#39;=>&#39;<?php endfor; ?>&#39;,  
            /*输出数组变量内容标签*/  
            &#39;<${&#39;=>&#39;<?php echo &#39;,  
            &#39;}$>&#39;=>&#39;; ?>&#39;,  
            /*加载文件标签*/  
            &#39;</{&#39;=>&#39;<?php include($this->web_root.\&#39;&#39;,  
            &#39;}/>&#39;=>&#39;\&#39;); ?>&#39;,  
              
            &#39;<{&#39;=>&#39;<?php &#39;,  
            &#39;}>&#39;=>&#39; ;?>&#39;  
        );  
        foreach($html_file_tag as $key=>$keyvalue)  
        {  
            $this->out_put_content=str_replace($key,$keyvalue,$this->out_put_content);  
        }  
    }  
    /* 
    *引用其它类文件 
    */  
    function include_class($classname)  
    {  
        @include($this->web_root.&#39;core/&#39;.$classname.&#39;.php&#39;);  
        $this->class_obj=new $classname();  
    }  
    /* 
    释放资源 
    */  
    function __destruct()  
    {  
        unset($this->out_put_content);  
        unset($this->_array);  
        unset($this->class_obj);  
    }  
}  
?>