Summary of file operations and directory operations in PHP common technical articles, _PHP tutorial

Summary of file operations and directory operations in PHP common technical articles,

1. Basic file operations

The basic operations of files include: file judgment, directory judgment, file size, read-write judgment, existence judgment and file time, etc.

<&#63;php
   header("content-type","text/html;charset=utf-8");
 /*
 *声明一个函数，传入文件名获取文件属性
 *@param string $fileName 文件名称
 */
 function getFilePro($fileName)
 {
   if(!file_exists($fileName))
   {
     echo '文件不存在<br/>';
     return;
   }
   /*是否是普通文件*/
   if(is_file($fileName))
   {
     echo $fileName.'是一个文件<br/>';
   }
   /*是否是目录*/
   if(is_dir($fileName))
   {
     echo $fileName.'是一个目录';
   }
   /*输出文件的型态*/
   echo '文件型态是：'.getFileType($fileName).'<br/>';
   /*文件大小,转换单位*/
   echo '文件大小是：'.getFileSize(filesize($fileName)).'<br/>';
   /*文件是否可读*/
   if(is_readable($fileName))
   {
     echo '文件可读<br/>';
   }
   /*文件是否可写*/
   if(is_writable($fileName))
   {
     echo '文件可写<br/>';
   }
   /*文件是否可执行*/
   if(is_executable($fileName))
   {
     echo '文件可执行<br/>';
   }

   echo '文件创立时间：'.date('Y年m月j日',filectime($fileName)).'<br/>';
   echo '文件最后修改时间：'.date('Y年m月j日',filemtime($fileName)).'<br/>';
   echo '文件最后打开时间：'.date('Y年m月j日',fileatime($fileName)).'<br/>';
 }

 /*
 *声明一个函数，返回文件类型
 *@param string $fileName 文件名称
 */
 function getFileType($fileName)
 {
   $type = '';
   switch(filetype($fileName))
   {
     case 'file':$type .= '普通文件';break;
     case 'dir':$type .= '目录文件';break;
     case 'block':$type .= '块设备文件';break;
     case 'char':$type .= '字符设备文件';break;
     case 'filo':$type .= '管道文件';break;
     case 'link':$type .= '符号链接';break;
     case 'unknown':$type .= '未知文件';break;
     default:
   }
   return $type;
 }

 /*
 *声明一个函数，返回文件大小
 *@param int $bytes 文件字节数
 */
 function getFileSize($bytes)
 {
   if($bytes >= pow(2,40))
   {
     $return = round($bytes / pow(1024,4),2);
     $suffix = 'TB';
   }
   else if($bytes >= pow(2,30))
   {
     $return = round($bytes / pow(1024,3),2);
     $suffix = 'GB';
   }
   else if($bytes >= pow(2,20))
   {
     $return = round($bytes / pow(1024,2),2);
     $suffix = 'MB';
   }
   else if($bytes >= pow(2,10))
   {
     $return = round($bytes / pow(1024,1),2);
     $suffix = 'KB';
   }
   else
   {
     $return = $bytes;
     $suffix = 'B';
   }
  return $return." ".$suffix;
}

 /*调用函数，传入test目录下的test.txt文件*/
 getFilePro('./test/div.html');
&#63;>

Result:

2. Directory operations

Directory operations include: directory traversal, deletion, copy, size statistics, etc.

1. Traverse the directory

 /*
 *遍历目录
 *@param string $dirName 目录名
 */
 function findDir($dirName)
 {
   $num = 0; /*统计子文件个数*/
   $dir_handle = opendir($dirName); /*打开目录*/
   /*输出目录文件*/
   echo '<table border="0" align="center" width="600" cellspacing="0" cellpadding="0">';
   echo '<caption><h2>目录'.$dirName.'下的文件</h2></caption>';
   echo '<tr align="left" bgcolor="#cccccc"';
   echo '<th>文件名</th><th>文件大小</th><th>文件类型</th><th>修改时间</th></tr>';

   while($file = readdir($dir_handle))
   {
     $dirFile = $dirName.'/'.$file;
     $bgcolor = $num++%2==0&#63;'#ffffff':'#cccccc';
     echo '<tr bgcolor='.$bgcolor.'>';
     echo '<td>'.$file.'</td>';
     echo '<td>'.filesize($dirFile).'</td>';
     echo '<td>'.filetype($dirFile).'</td>';
     echo '<td>'.date('Y/n/t',filemtime($dirFile)).'</td>';
     echo '</tr>';
   }
   echo "</table>";
   closedir($dir_handle); /*关闭目录*/
   echo "在<b>".$dirName."</b>目录下共有<b>".$num.'</b>个子文件';
 }
 /*传递当前目录下的test目录*/
 findDir('./test');

Results

2. Statistical directory size

 /*
 *统计目录大小
 *@param string $dirName 目录名
 *@return double
 */

function dirSize($dirName)
{
   $dir_size = 0;
   if($dir_handle = @opendir($dirName))
   {
     while ($fileName = readdir($dir_handle))
     {
       /*排除两个特殊目录*/
       if($fileName != '.' && $fileName != '..')
       {
         $subFile = $dirName.'/'.$fileName;
         if(is_file($subFile))
         {
           $dir_size += filesize($subFile);
         }
         if(is_dir($subFile))
         {
           $dir_size += dirSize($subFile);
         }
       }
     }
     closedir($dir_handle);
     return $dir_size;
   }
 }
 /*传递当前目录下的test目录*/
 $dir_size = dirSize('./test');
 echo './test目录文件大小是：'.round($dir_size / pow(1024,1),2).'KB';

Result:

3. Delete directory

/*
*删除目录
*@param string $dirName 目录名
 */
 function delDir($dirName)
 {
   /*php中的mkdir函数就可以创建目录*/
   if(file_exists($dirName))
   {
     if($dir_handle = @opendir($dirName))
     {
       while ($fileName = readdir($dir_handle))
       {
         /*排除两个特殊目录*/
         if($fileName != '.' && $fileName != '..')
         {
           $subFile = $dirName.'/'.$fileName;
           if(is_file($subFile))
           {
             unlink($subFile);
           }
           if(is_dir($subFile))
           {
             delDir($subFile);
           }
         }
       }
       closedir($dir_handle);
       rmdir($dirName);
       return $dirName.'目录已经删除';
     }
   }
 }
 /*传递test目录的副本test1*/
 echo delDir('./test1');
 

Prompt message for successful deletion

4. Copy directory

 /*
 *复制目录
 *@param string $dirSrc 原目录名
 *@param string $dirTo 目标目录名
 */
 function copyDir($dirSrc,$dirTo)
 {
   if(is_file($dirTo))
   {
     echo '目标目录不能创建';/*目标不是一个*/
     return;
   }
   if(!file_exists($dirTo))
   {
     /*目录不存在则创建*/
     mkdir($dirTo);
   }
   if($dir_handle = @opendir($dirSrc))
   {
     while ($fileName = readdir($dir_handle))
     {
       /*排除两个特殊目录*/
       if($fileName != '.' && $fileName != '..')
       {
         $subSrcFile = $dirSrc.'/'.$fileName;
         $subToFile = $dirTo.'/'.$fileName;
         if(is_file($subSrcFile))
         {
           copy($subSrcFile,$subToFile);
         }
         if(is_dir($subSrcFile))
         {
           copyDir($subSrcFile,$subToFile);
         }
       }
     }
     closedir($dir_handle);
     return $dirSrc.'目录已经复制到'.$dirTo.'目录';
   }
 }
 echo copyDir('./test','../testcopy');

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