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PHP判断文件是否被修改实例

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Jun 08, 2016 pm 05:23 PM

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在网站的管理系统中，有时需要查看某个文件是否被修改过、在什么时间被修改的、最后的修改时间是什么时候，本实例就可以实现这个功能，对表单中提交的文件进行判断，检测出修改时间。

关键技术

   本实例主要应用filectime()和filemtime()函数，检测文件的incode最后改变时间和最后的修改时间，并应用date()函数对检测返回的时间戳进行格式化。
   filectime()函数，返回指定文件filename的inode最后改变时间，语法如下：
   int filectime(string filename);
   成功则返回UNIX时间戳，否则返回FALSE。
   filemtime()函数，返回指定文件filename的最后修改时间，语法如下：
   成功则返回UNIX时间戳，否则返回FALSE。
设计过程
首先，设计网页页面。然后，创建一个表单，通过文件域提交要判断的文件。接着，获取表单中提交的文件路径，应用filectime()和filemtime()函数对提交的文件进行检测。最后，输出检测结果。
index.php文件的关键代码如下：

代码如下

复制代码

$file=iconv("utf-8","gb2312",$_POST['files']);           //实现编码格式的转换
if(file_exists($file)){                                  //判断文件是否存在
          $change_time=filectime($file);                   //获取文件的最后incode时间
          $time=date("Y-m-d h:i:s",$change_time);          //时间戳的格式化
          $last_time=filemtime($file);                     //获取文件的最后修改时间
          $times=date("Y-m-d h:i:s",$last_time);           //时间戳的格式化
   }else{
          $result="该文件不存在";
   }
   ?>

秘笈心法
获取文件的最后访问时间。
通过文件系统函数不但可以获取文件的最后修改时间，而且可以获取文件的最后访问时间，其应用的是fileatime()函数

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