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, file time, etc.

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header("content-type","text/html;charset=utf-8"); /* *Declare a function, pass in the file name to get the file attributes *@param string $fileName file name */ function getFilePro($fileName) { if(!file_exists($fileName)) { echo 'File does not exist '; return; } /*Is it an ordinary file*/ if(is_file($fileName)) { echo $fileName.' is a file '; } /*Is it a directory*/ if(is_dir($fileName)) { echo $fileName.'is a directory'; } /*Output file type*/ echo 'The file type is: '.getFileType($fileName).' '; /*File size, conversion unit*/ echo 'The file size is:'.getFileSize(filesize($fileName)).' '; /*Whether the file is readable*/ if(is_readable($fileName)) { echo 'The file is readable '; } /*Whether the file is writable*/ if(is_writable($fileName)) { echo 'The file is writable '; } /*Whether the file is executable*/ if(is_executable($fileName)) { echo 'The file is executable '; } echo 'File creation time:'.date('Y year m month j day',filectime($fileName)).' '; echo 'The last modification time of the file:'.date('Y year m month j day',filemtime($fileName)).' '; echo 'The last time the file was opened:'.date('Y year m month j day',fileatime($fileName)).' '; } /* *Declare a function that returns the file type *@param string $fileName file name */ function getFileType($fileName) { $type = ''; switch(filetype($fileName)) { case 'file':$type .= 'normal file';break; case 'dir':$type .= 'directory file';break; case 'block':$type .= 'block device file';break; case 'char':$type .= 'Character device file';break; case 'filo':$type .= 'pipe file';break; case 'link':$type .= 'symbolic link';break; case 'unknown':$type .= 'Unknown file';break; default: } return $type; } /* *Declare a function to return the file size *@param int $bytes Number of bytes in the file */ function getFileSize($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; } /*Call the function and pass in the test.txt file in the test directory*/ getFilePro('./test/div.html'); ?>

Result:

2. Directory operations

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

1. Traverse the directory

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/*

*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 '

';

  echo '

';

  echo '

  echo '

';

 

  while($file = readdir($dir_handle))

  {

    $dirFile = $dirName.'/'.$file;

    $bgcolor = $num++%2==0?'#ffffff':'#cccccc';

    echo '

';

    echo '

';

    echo '

';

    echo '

';

    echo '

';

    echo '

';

  }

  echo "

目录'.$dirName.'下的文件

文件名	文件大小	文件类型	修改时间
'.$file.'	'.filesize($dirFile).'	'.filetype($dirFile).'	'.date('Y/n/t',filemtime($dirFile)).'

";

  closedir($dir_handle); /*关闭目录*/

  echo "在".$dirName."目录下共有".$num.'个子文件';

}

/*传递当前目录下的test目录*/

findDir('./test');

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/* *Traverse directories *@param string $dirName directory name */ function findDir($dirName) { $num = 0; /*Count the number of sub-files*/ $dir_handle = opendir($dirName); /*Open directory*/ /*Output directory file*/ echo ''; echo ''; echo ' echo '< ;/tr>'; while($file = readdir($dir_handle)) { $dirFile = $dirName.'/'.$file; $bgcolor = $num++%2==0?'#ffffff':'#cccccc'; echo ''; echo ''; echo ''; echo ''; echo ''; echo ''; } echo "

Files under directory '.$dirName.'

File name	File size	File type	Modification time
'.$file.'	'.filesize($dirFile).'	'.filetype($dirFile).'	'.date('Y/n/t',filemtime($dirFile)).'

"; closedir($dir_handle); /*Close directory*/ echo "There are ".$num.' sub-files in the ".$dirName." directory'; } /*Pass the test directory under the current directory*/ findDir('./test');

Results

2. Statistical directory size

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/*  *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';

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/* *Statistics directory size *@param string $dirName directory name *@return double */ function dirSize($dirName) { $dir_size = 0; if($dir_handle = @opendir($dirName)) { while ($fileName = readdir($dir_handle)) { /*Exclude two special directories*/ if($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; } } /*Pass the test directory under the current directory*/ $dir_size = dirSize('./test'); echo './test directory file size is: '.round($dir_size / pow(1024,1),2).'KB';

Result:

3. Delete directory

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/* *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');

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/* *Delete directory *@param string $dirName directory name */ function delDir($dirName) { /*The mkdir function in php can create a directory*/ if(file_exists($dirName)) { if($dir_handle = @opendir($dirName)) { while ($fileName = readdir($dir_handle))         { /*Exclude two special directories*/ if($fileName != '.' && $fileName != '..')          { $subFile = $dirName.'/'.$fileName; if(is_file($subFile))           { unlink($subFile);         } if(is_dir($subFile))             { delDir($subFile);         } } } closedir($dir_handle); rmdir($dirName); return $dirName.'The directory has been deleted'; } } } /*Pass a copy of the test directory test1*/ echo delDir('./test1');

Prompt message for successful deletion

4. Copy directory

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/* *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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/* *Copy directory *@param string $dirSrc original directory name *@param string $dirTo target directory name */ function copyDir($dirSrc,$dirTo) { if(is_file($dirTo)) { echo 'The target directory cannot be created';/*The target is not one*/ return; } if(!file_exists($dirTo)) { /*Create the directory if it does not exist*/ mkdir($dirTo); } if($dir_handle = @opendir($dirSrc)) { while ($fileName = readdir($dir_handle)) { /*Exclude two special directories*/ 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 $dirSrc.' directory has been copied to '.$dirTo.' directory'; } } echo copyDir('./test','../testcopy');

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