php模板引擎技术简单实现_php实例

WBOY
Release: 2016-06-07 17:08:52
Original
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用了smarty,tp过后,也想了解了解其模板技术是怎么实现,于是写一个简单的模板类,大致就是读取模板文件->替换模板文件的内容->保存或者静态化 

tpl.class.php主要解析

  assign 方法实现     

/**
     * 模板赋值操作
     * @param mixed $tpl_var 如果是字符串,就作为数组索引,如果是数组,就循环赋值
     * @param mixed $tpl_value 当$tpl_var为string时的值,默认为 null
     */
    public function assign($tpl_var,$tpl_value=null){
      if(is_array($tpl_var) && count($tpl_var) > 0){
        foreach ($tpl_var as $k => $v) {
          $this->tpl_vars[$k] = $v;
        }
      }elseif($tpl_var){
        $this->tpl_vars[$tpl_var] = $tpl_value;
      }
    }
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fetch 方法实现

     /**
      * 生成编译文件
      * @param string $tplFile 模板路径
      * @param string $comFile 编译路径
      * @return string
     */
    private function fetch($tplFile,$comFile){

      //判断编译文件是否需要重新生成(编译文件是否存在或者模板文件修改时间大于编译文件的修改时间)
      if(!file_exists($comFile) || filemtime($tplFile) > filemtime($comFile)){
        //编译,此处也可以使用ob_start()进行静态化
        $content = $this->tplReplace(file_get_contents($tplFile));
        file_put_contents($comFile, $content);
      }

    }  
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简单编译方法:按照规则进行正则替换

 /**
     * 编译文件
     * @param string $content 待编译的内容
     * @return string
     */
    private function tplReplace($content){
      //转义左右定界符 正则表达式字符
      $left = preg_quote($this->left_delimiter,'/');
      $right = preg_quote($this->right_delimiter,'/');

      //简单模拟编译 变量
      $pattern = array(
          //例如{$test}
          '/'.$left.'\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)'.$right.'/i'
        );

      $replace = array(
          '<&#63;php echo $this->tpl_vars[\'${1}\']; &#63;>'
        );

      //正则处理
      return preg_replace($pattern, $replace, $content);
    }

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display = fetch+echo

 /**
     * 输出内容
     * @param string $fileName 模板文件名
     */
    public function display($fileName){
      //模板路径
      $tplFile = $this->template_dir.'/'.$fileName;

      //判断模板是否存在
      if(!file_exists($tplFile)){
        $this->errorMessage = '模板文件不存在';
        return false;
      }

      //编译后的文件
      $comFile = $this->compile_dir.'/'.md5($fileName).'.php';

      $this->fetch($tplFile,$comFile);
      
       include $comFile;
    }

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其他属性

 //模板文件存放位置
    private $template_dir = 'templates'; 

    //编译文件存放位置
    private $compile_dir = 'compiles';

    //左定界符
    private $left_delimiter = '{';

    //右定界符 
    private $right_delimiter = '}'; 

    //内部临时变量,存储用户赋值
    private $tpl_vars = array();

    //错误信息
    private $errorMessage = '';

    /**
     * 修改类属性的值
     * @param array $configs 需要修改的相关属性及值
     * @return bool
     */
    public function setConfigs(array $configs){
      if(count($configs) > 0){
        foreach ($configs as $k => $v) {
          if(isset($this->$k))
            $this->$k = $v;
        }
        return true;
      }
      return false;
    }

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测试

模板文件 testTpl.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>test_tpl_demo</title>
</head>
<body>
  {$name}:{$age}:{$message}
</body>
</html>
运行文件 test_tpl.php
<&#63;php
  require 'Tpl.class.php';
  
  $tpl = new Tpl();
  $tplarr = array(
      'name'=>'waited',
      'age'=>'100'
    );
  $tpl->assign($tplarr);
  $tpl->assign('message','this is a demo');
  $tpl->display('testTpl.html');

&#63;>

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输出:waited:100:this is a demo

生成编译文件:972fa4d270e295005c36c1dbc7e6a56c.php

以上就是本文的全部内容,希望对大家的学习有所帮助。

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