模板引擎逻辑语句处理之对单层for循环的处理

先上代码

private function moldforExt(){//模板单层For循环处理
		$SQL=$this->sql_obj;
		$URL=$this->url_obj;
		require($this->dataFile);
		$con=$this->moldFileContent;
		$con=str_replace("\n","<#tmoldbr#>",$con);
		$preg_for_str="/<!\-\-\s*for\[([a-zA-Z_\-0-9]+):([a-zA-Z_\-0-9]+)\]\s*\-\->([^!]*)<!\-\-\s*endfor\s*\-\->/";
		preg_match_all($preg_for_str,$con,$preg_for_match);
		$preg_for_num=count($preg_for_match[0]);
		for($for_tem_i=0;$for_tem_i<$preg_for_num;$for_tem_i++){
			$tem_for_st=$preg_for_match[1][$for_tem_i];
			$tem_for_ed=$preg_for_match[2][$for_tem_i];
			if(isset($$tem_for_st)&&isset($$tem_for_ed)){
				$for_tem_start=$$tem_for_st;
				$for_tem_end=$$tem_for_ed;		
				$for_tem_con="";
				for($for_tem_j=$for_tem_start;$for_tem_j<$for_tem_end;$for_tem_j++){
					$tttem_for_com=$preg_for_match[3][$for_tem_i];
					$tttem_for_com=str_replace("({".$tem_for_st."})",$for_tem_j,$tttem_for_com);
					$for_tem_con.=$tttem_for_com;
				}
				$con=str_replace($preg_for_match[0][$for_tem_i],$for_tem_con,$con);
			}
		}
		$this->moldFileContent=str_replace("<#tmoldbr#>","\n",$con);
	}

其实里面用到的还是基于正则表达式

在模板中所写的for循环样式如下

<!-- for[strat:end] -->
...
HTML代码
...
<!-- endfor -->

将它写成html注释的形式是为了防止在只浏览模板文件时造成排版错误。

for循环的开始标识start会在模板数据文件中对$start的存在进行检测，这里面用到了PHP内部的可变变量,讲一个变量的值作为一个变量名来使用。