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php模板引擎技术简单实现_PHP

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May 27, 2016 am 10:36 AM

php template engine

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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