PHP, file and directory operation

fopen, fwrite, fread, fcolse, file_put_contents, file_get_contents,
change file line break to HTML line break: nl2br
example:
if($handle=fopen(test.txt','r')){
   $content=fread($handle);
    fclose($handle);
}
echo nl2br($content);

Get line by line fgets

if($handle=fopen(test.txt','r')){
     while(1feof($handle)(
          $content=fgets($handle);
       echo $content."<br />";
      }
fclose($handle);
}

filesize: file size
filemtime: modified time (change content)
filectime: changed time (change content or metadata such as chmod)
fileatime: last access time such as read  or change.

Example
echo strftime('%m/%d/%Y %H%M',  filemtime($filename))."<br />";
touch($filename): update file time.

Directory operation
get current working directory: getcwd
create a new directory: mkdir
Example
makdir('mydir','0777'); //note permission  may be overwritten by umask
makdir('mydir/dir1/dir2','0777',true);recursively create new directoy

change directory chdir
remove a directory: rmdir
is_dir: to check if it is a directory
opendir: open directory to get directory handler
readdir: to get each file in a directory
Example:
if($mydir=opendir('test')){
    while($filename=readdir($mydir))
        echo $filename.'<br />';
}

Close directory: closedir
scandir:  read all file names in the directory into an array
Example:
$file_array=scandir('test');
foreach($file_array as $filename) 
       echo $filename.'<br />';
To remove .  and .. in the array, we can add
if(stripos($filename, '.')>0) // i.e first occurrence of  '.' not the first position.

>> &raquo;