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。