PHP section--File operation

files in PHP refer to files and folders, not single-finger files.  1. Determine the file (whether it is a file or a folder) to find the file, the output is file, which represents the document.

Var_dump (FileType ("./aa.txt"));

Find the folder, the output is Dir, which represents the directory.

Var_dump (FileType ("./aa"));

Judging is not a file, the return is true

Var_dump (Is_file ("./aa.txt"));

Judging is not a folder, the return is true

Var_dump (Is_dir ("./aa"));

2. File attributes
Gets the root www of the current server

Gets the last access time of the file, and the timestamp is returned.

echo Date (Fileatime ("./aa.txt"));

Turn the timestamp into time.

echo Date ("Y-m-d h:i:s", Fileatime ("./aa.txt"))

Get File creation time

echo Date ("Y-m-d h:i:s", Filectime ("./aa.txt"));

Get File modification Time

echo Date ("Y-m-d h:i:s", Filemtime ("./aa.txt"));//

Returns the size of the file, in bytes B.

echo filesize ("Aa.txt");

Determines whether the file exists, exists to return true, and does not exist to return flase.

Var_dump (file_exists ("Aa.txt"));

3. File path./Represents the current path: /on behalf of the parent path in the page refers to the document root, the root in PHP is the disk directory, the Web page/also represents the root, is the WWW directory. Returns d:/wamp/www/, which takes the root of the server.

echo $_server[' Document_root '];

Returns a index.php that returns a file name.

Echo basename ("/wamp/www/index.php");

Returns index, which returns only the file name.

Echo basename ("/wamp/www/index.php", ". php");

Returns/WAMP/WWW, just gets the directory.

Echo dirname ("/wamp/www/index.php");

Returns an array that contains information about the directory, file name, file format, and so on.

Var_dump (PathInfo ("/wamp/www/index.php"));

Returns the D:\wamp\www\wenjiancaozuo\aa.txt, converting the relative path to an absolute path.

Echo Realpath ("./aa.txt");

4. Directory operations Create a directory

mkdir ("./bb");

To delete a directory, only empty folders can be deleted. The contents of the folder can not be deleted, will be an error.

RmDir ("BB");

Moving a folder is actually renaming the file to a location.

Rename ("./cc", "./aa/cc");

You can change the file name while moving.

Rename ("./cc", "./aa/dd");

5. Traverse the directory * * Traverse all the files under the rental folder, equivalent to not search within the amount.

Var_dump (Glob ("./zufang/*"));

Traversing files in file format as PHP

Var_dump (Glob ("./zufang/*.php"));

Open the directory resource and always remember to close it when you open it.

$dir = Opendir ("./zufang");

return:  Represents the current directory

Echo Readdir ();

Return to ...  . represent the parent directory

Echo Readdir ();

Returns the first file

Echo Readdir ();

Returns a second file

Echo Readdir ();

All files are traversed and folders can be read.

while ($f = Readdir ($dir)) {    echo $f;}

Close Directory Resource

Closedir ($dir);//

Example 1: Method 1: Give a folder, read the number of files in the folder

Echo Shuliang ("./zufang"), function Shuliang ($filename) {     $sum = 0;    $dir = Opendir ($filename);   while ($f = Readdir ($dir))     {        if ($f = = "." | | $f = = "...") If the traversal is. Or ..., nothing is done.       {                     }        else       {            $lujing = $filename. " /". $f;            if (Is_file ($lujing))           {               $sum + +;            }             else             {                $sum = $sum +shuliang ($lujing);    }} Closedir ($dir);    return $sum; }

Example 1: Method 2: This method is used to get the number of files under the specified folder

function Shuliang ($filename) {$attr = Glob ($filename. ") /* "), $n = count ($attr), foreach ($attr as $v) {if (Is_dir ($v)) {$n = $n +shuliang ($v);}}    return $n;} Echo Shuliang ("./0904");

Example 2: Get the size of all the files in a directory

function Fsize ($fname) {$size = 0; $dir = opendir ($fname);//traverse directory, find file, accumulate size while ($u = Readdir ($dir)) {if ($u = = "." | | $u = = "..") {}else{$zfname = $fname. " /". $u, if (Is_file ($zfname)) {$size + = FileSize ($zfname);}} Locate the subdirectory, get the file size Rewinddir ($dir) in the subdirectory, while ($u = Readdir ($dir)) {if ($u = = "." | | $u = = "...") {}else{$zfname = $fname. " /". $u, if (Is_dir ($zfname)) {$size + = fsize ($zfname);}} Closedir ($dir); return $size;} Echo fsize ("./0904");

6. File operations (1) file overall operation create file

Touch ("./cc.txt");

Assignment file, the first parameter is the file to be copied, and the second is where to copy the file.

Copy ("./cc.txt", "./aa/cc.txt");//

deleting files

Unlink ("./cc.txt");//

Read the contents of the file can only read txt, HTML, PHP, and so on, word, wxcle documents can not read.

Echo file_get_contents ("./aa.txt");//

This method is more important, can fetch data from the net, match with regular expression.

Echo file_get_contents ("http://www.baidu.com");//

Write content to the file, and the content will overwrite the original content.

File_put_contents ("./aa.txt", "Hello");//

Modify the contents of the page

File_put_contents ("./ceshi.php", "Hello");//

Get and output, front no write output. File_get_contents need to write output echo.

ReadFile ("http://www.baidu.com");//

Display the Code of the Web page in one line.

Var_dump (File ("http://www.baidu.com"));//

The first parameter is the open file, the second one is open, the way you can view the PHP manual.

$f = fopen ("./aa.txt", "R");//

The content of Aa.txt is hello. This returns the H

echo fgetc ($f);//

Return E

echo fgetc ($f);//

return L

echo fgetc ($f);//

.... fgetc () is read one line at a time

Echo fgets ($f);

Read the length, here is read 2 length, return he.

Echo Fread ($f, 2);

You must close the file when it is opened, and you cannot do anything else without closing it. */

Fclose ($f);

A way is to append

$f = fopen ("./aa.txt", "a");

Write the world behind Hello

Fwrite ($f, "World");

Fclose ($f);

To a folder, delete the folder

Shanchu ("./zufang"), function Shanchu ($filename) {   if (Is_dir ($filename))//judgment is file   {        $dir = Opendir ($ filename);//Open folder while               ($f = Readdir ($dir))//Iterate through all contents of the folder       {           if ($d = = ".") To get rid of            . {                         }            else//operation is not. and. The content         {                $fname = $filename. " /". $f;//Find the traversed content, and spell out the format similar to Wamp/zufang if                (Is_file ($fname))//If it is the file              {                    unlink ($fname);                }              else//if it is a folder               {                    Shanchu ($fname);//The Shanchu method is called again, the deleted folder is changed.                }          }        }       Closedir ($dir);//Close folder       rmdir ($filename);//Delete the contents of the folder after deleting the folder   }     else//If it is an empty folder    {         Unlink ($filename);//delete the Empty folder     }}

PHP section--File operation