PHP 实现简单的模板引擎

模板引擎作为视图层和模型曾分离的一种解决方案。

首先我们新建一个Template.class.php 的文件

<?phpclass Template{		private $arrayConfig = array(		'suffix'      => '.m', 			//设置模板文件		'templateDir' => 'template/', 	//设置模板所在的文件夹		'compileDir'  => 'cache',		'debug'      => false,		//设置编译后存放的目录		'cache_htm'	  =>  true,		//是否需要编译成静态的html文件		'suffix_cache'=> '.htm',		//编译后的文件后缀			'cache_time'  =>2000,			// 多长时间自动更新		'php_turn'    =>false,			//是否支持原生的php代码		'cache_control' => 'control.dat',		);			private $compileTool;		//编译器	public $filename;		//模板文件名称	private $value =array();		//值栈	static private $instance  = null;		public $debug = array();	//调试信息	public function __construct($arrayConfig =array()){	        //返回当前UNIX时间戳和微妙数		$this->debug['begin'] = microtime(true);		$this->arrayConfig =$arrayConfig+$this->arrayConfig;		$this->getPath();		if(!is_dir($this->arrayConfig['templateDir'])){			exit("template isnt not found");		}		if(!is_dir($this->arrayConfig['compileDir'])){						mkdir($this->arrayConfig['compileDir'],0770,true);		}	include("Compile.class.php");		//$this->compileTool = new Compile;	}	/**				路径处理为绝对路径		*/	public function getPath(){		$this->arrayConfig['templateDir'] = strtr(realpath($this->arrayConfig['templateDir']),'\\','/').'/';		$this->arrayConfig['compileDir'] = strtr(realpath($this->arrayConfig['compileDir']),'\\','/').'/';	}		/***				单例模式获取模板的实例	**/	public static function getInstance(){		if(is_null(self::$instance)){			self::$instance = new Template();		}		return self::$instance;	}		public function setConfig($key,$value = null){		if(is_array($key)){			$this->arrayConfig = $key+$this->arrayConfig;		}else{			$this->arrayConfig[$key] = $value;		}	}	public function getConfig($key = null){		if($key){			return $this->arrayConfig[$key];		}else{			return $this->arrayConfig;		}			}		/**		    注入单个变量	**/	public function assign($key,$value){		$this->value[$key] = $value;	}		/**	    注入多个变量	**/	public function assignArray($array){		if(is_array($array)){				foreach($array as $k => $v){					$this->value[$k] = $v;				}						}	}	/***	        获取模板文件的路径		**/		public function path(){		return $this->arrayConfig['templateDir'].$this->filename.$this->arrayConfig['suffix'];	}	/***			是否需要缓存	**/	public function needCache(){		return $this->arrayConfig['cache_htm'];	}		/***				是否需要重新生成缓存文件	**/		public function reCache($file){		$flag = false;		//生成缓存文件		$cacheFile = $this->arrayConfig['compileDir'].md5(@$filename).'.'.'php';		//var_dump($cacheFile);		if($this->arrayConfig['cache_htm']===true){				//设置timeflag （判断当前时间-模板文件上次修改的时间）是否小于设置的缓存时间		//如果小于则返回TRUE					$timeFlag = (time()-@filemtime($cacheFile))<$this->arrayConfig['cache_time']?			true:false;	//1，判断缓存文件是否存在，	//2，缓存文件是否有内容	//3，时间是否在设置的缓存时间之内					if(!is_file($cacheFile)&&filesize($cacheFile)>1&&$timeFlag){				$flag = true;			}else{				$flag = false;			}		}		return $flag;	}	/***		显示模板	**/	public function show($file){		$this->filename =$file;		if(!is_file($this->path())){			exit('找不到相对应的模板');		}		$compileFile = $this->arrayConfig['compileDir'].'/'.md5(@$filename).'.php';		$cacheFile = $this->arrayConfig['compileDir'].md5(@$filename).'.htm';	//	echo $compileFile;		//echo $cacheFile;		if($this->reCache($file)===false){			$this->debug['cached'] = 'false';		//	var_dump($compileFile);			$this->compileTool = new Compile($this->path(),$compileFile,$this->arrayConfig);			if($this->needCache()){			//是否需要缓存				ob_start();			}			//函数从数组中把变量导入到当前的符号表中			extract($this->value,EXTR_OVERWRITE);			//判断 文件是否存在，生成文件的修改时间是否小于模板文件修改时间			if(@is_file($compileFile)||filemtime($compileFile)<filemtime($this->path())){				$this->compileTool->vars = $this->value;				$this->compileTool->compile();				//引入文件				include $compileFile;			}else{				include $compileFile;			}			if($this->needCache()){			//如果需要缓存的话				$message = ob_get_contents();				//则生成缓存文件				file_put_contents($cacheFile,$message);			}					}else{		//如果缓存文件时间小于设定的时间		//直接读取缓存文件			readfile($cacheFile);			//$this->debug['cached'] = true;		}		$this->debug['spend'] = microtime(true) - $this->debug['begin'];		$this->debug['count'] = count($this->value);		$this->debug_info();				/*		var_dump($compileFile);this		var_dump($this->path());		if(!is_file($compileFile)){			mkdir($this->arrayConfig['compileDir']);  //	此处若存在需要判断			$this->compileTool->compile($this->path(),$compileFile);			readfile($compileFile);		}else{			readfile($compileFile);		}		*/	}	/***			debug 调试函数	**/	public function debug_info(){		//$this->arrayConfig['debug']=false;		if($this->arrayConfig['debug']===true){			var_dump($this);			echo "程序运行日期",date("Y-m-d h:i:s")."</br>";			echo "模板解析耗时",$this->debug['spend'],'秒'."</br>";			echo "模板包含标签数目",$this->debug['count']."</br>";			echo "是否使用静态缓存",$this->debug['cached']."</br>";			//echo "模板引擎实例参数",var_dump($this->getConfig());		}	}	/******		清楚缓存的文件			*****/	public function clean($path = null){		if($path = null){			$path = $this->arrayConfig['CompileDir'];			$path = glob($path.'*'.$this->arrayConfig['suffix_cache']);			//glob 函数返回匹配指定的文件夹目录					}else{			$path = $this->arrayConfig['compileDir'].md5($path).'.htm';			foreach((array)$path as $v){			//删除				unlink($v);			}		}	}			}

新建一个 Compile.class.php 翻译模板文件

<?php	class Compile{		private $template;	//待编译的文件		private $content;	//需要替换的文本		private $comfile;		//编译后的 文件		private $left = '{';				private $right = '}';		private $value =array();  // 值栈		private $phpTurn;		private $T_P = 	array();		private $T_R = array();						public function __construct($template,$compileFile,$config){			//echo $template;			//echo $compileFile;			$this->template = $template;			$this->comfile = $compileFile;			$this->content = file_get_contents($template);			if($config['php_turn']===false){				//echo "123";				//$this->T_R[]="";			}			//echo "123";			//正则匹配 {$xxx} 格式			$this->T_P[]="#\{\\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\}#";			$this->T_R[]="<?php echo \$this->value['\\1'];?>";		}		public function compile(){			$this->c_var2();			//$this->c_staticFile();			//var_dump($this);			file_put_contents($this->comfile,$this->content);		}		public function c_var2(){		//        将{$xxx} 替换为<?php echo $xxx?>			$this->content = preg_replace($this->T_P,$this->T_R,$this->content);		}		public function c_staticFile(){			$this->content =preg_replace('#\{\!(.*?)\!\}#','<script src =\\1'.'?t='.time().'></script>',$this->content);		}		public function __set($name,$value){			$this->$name = $value;					}		public function __get($name){			return $this->$name;					}	}

新建一个测试文件 test.php

<?phpinclude "Template.class.php";$tpl = Template::getInstance();//$tpl = new Template(array('php_turn'=>false,'debug'=>false));$tpl->assign('data','hello world');$tpl->show('member');//var_dump($tpl->getConfig());

模板文件member.m

<html><head></head><body><h1 id="welcome">welcome</h1></body>{$data}</html>

显示截图

借鉴  php核心技术与最佳实践