PHP文本操作类

代码如下:<?php  
class CtbClass {   

           var  $file;           
           var  $index;       

       //建立一个文件并写入输入   
           function  null_write($new)   
           {   
                       $f=fopen($this->file,"w");           
                       flock($f,LOCK_EX);   
                       fputs($f,$new);           
                       fclose($f);     
           }   
           //  添加数据记录到文件末端   
           function  add_write($new)  {             
                       $f=fopen($this->file,"a");           
                       flock($f,LOCK_EX);   
                       fputs($f,$new);             
                       fclose($f);     
           }     
           //  配合readfile()的返回一起使用,把一行数据转换为一维数组   
           function  make_array($line)  {