PHP学习笔记8-文件操作

在data文件中写入数据：

 <?php
 /**
  * Created by PhpStorm.
  * User: Administrator
  * Date: 2015/6/29
  * Time: 17:05
  */
 header("Content-type: text/html; charset=utf-8");
 //write data
 $f = fopen('data','w');//打开文件
 fwrite($f,'Hello PHP');//写入数据
 fclose($f);//关闭文件
 echo 'OK';
 //windows环境暂时不考虑权限问题

写入成功后可以在页面看到“OK”

接下来读取data文件里的数据

 <?php
 /**
  * Created by PhpStorm.
  * User: Administrator
  * Date: 2015/6/29
  * Time: 17:05
  */
 header("Content-type: text/html; charset=utf-8");

 //read data
 $f = fopen('data','r');
 $content = fgets($f);
 echo $content;14 fclose($f);

如果有多行数据该怎么读取？

方法一 while：

 <?php
 /**
  * Created by PhpStorm.
  * User: Administrator
  * Date: 2015/6/29
  * Time: 17:05
  */
 header("Content-type: text/html; charset=utf-8");
 $f = fopen('data','r');
 //读取多行数据 while
 while(!feof($f)){//feof() 函数检测是否已到达文件末尾
     $content = fgets($f);
     echo $content;
 }
 fclose($f);

方法二 file_get_contents()：

 echo file_get_contents('data');