PHP学习笔记8-文件操作

在data文件中写入数据：

 1 <?php
 2 /**
 3  * Created by PhpStorm.
 4  * User: Administrator
 5  * Date: 2015/6/29
 6  * Time: 17:05
 7  */
 8 header("Content-type: text/html; charset=utf-8");
 9 //write data
10 $f = fopen('data','w');//打开文件
11 fwrite($f,'Hello PHP');//写入数据
12 fclose($f);//关闭文件
13 echo 'OK';
14 //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

 1 <?php
 2 /**
 3  * Created by PhpStorm.
 4  * User: Administrator
 5  * Date: 2015/6/29
 6  * Time: 17:05
 7  */
 8 header("Content-type: text/html; charset=utf-8");
 9 
10 //read data
11 $f = fopen('data','r');
12 $content = fgets($f);
13 echo $content;
14 fclose($f);

如果有多行数据该怎么读取？

方法一 while：

 1 <?php
 2 /**
 3  * Created by PhpStorm.
 4  * User: Administrator
 5  * Date: 2015/6/29
 6  * Time: 17:05
 7  */
 8 header("Content-type: text/html; charset=utf-8");
 9 $f = fopen('data','r');
10 //读取多行数据 while
11 while(!feof($f)){//feof() 函数检测是否已到达文件末尾
12     $content = fgets($f);
13     echo $content;
14 }
15 fclose($f);

方法二 file_get_contents()：

1 echo file_get_contents('data');