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Last updated: Fri, 11 Apr 2008

readdir

(PHP 4, PHP 5)

readdir — ディレクトリハンドルからエントリを読み込む

説明

string readdir ( resource $dir_handle )

ディレクトリから次のファイルのファイル名を返します。ファイル名はファイルシステム上に格納されている順番で返されます。

パラメータ

dir_handle: opendir() で事前にオープンしたディレクトリハンドルの resource 。

返り値

成功した場合にファイル名、失敗した場合に FALSE を返します。

警告

この関数は論理値 FALSE を返す可能性がありますが、FALSE として評価される 0 や "" といった値を返す可能性もあります。詳細については論理値のセクションを参照してください。この関数の返り値を調べるには ===演算子を使用してください。

例

例1 ディレクトリ内の全てのファイルのリストを得る

以下の例で、readdir() の返り値をどのように調べているかに注目してください。返り値が FALSE と一致することを、明示的に（値が等しく、かつ型も等しい - 詳細は比較演算子を参照ください）調べています。なぜなら、そうしないと FALSE と評価されてしまうディレクトリエントリ（例: "0" という名前のディレクトリ）があった場合にループがとまってしまうからです。


<?php
// 4.0.0-RC2 より前のバージョンでは、!== は存在しないことに注意しましょう

if ($handle = opendir('/path/to/files')) {
    echo "Directory handle: $handle\n";
    echo "Files:\n";

    /* ディレクトリをループする際の正しい方法です */
    while (false !== ($file = readdir($handle))) {
        echo "$file\n";
    }

    /* ディレクトリをループする際の「間違った」方法です */
    while ($file = readdir($handle)) {
        echo "$file\n";
    }

    closedir($handle);
}
?>

例2 カレントディレクトリの全てのファイルを一覧する。ただし . および .. は取り除く


<?php
if ($handle = opendir('.')) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
            echo "$file\n";
        }
    }
    closedir($handle);
}
?>

参考

rewinddir

" width="11" height="7"/>

opendir

Last updated: Fri, 11 Apr 2008

add a note User Contributed Notes
readdir

dbzfanatic_1 at hotmail dot com
19-Mar-2008 02:03


Here's an easy way to output the contents as a list of download links.



<?php

$count = 0;

if ($handle = opendir('.')) {

    while (false !== ($file = readdir($handle))) {

        if ($file != "." && $file != "..") {$count++;

            print("<a href=\"".$file."\">".$file."</a><br />\n");

        }

    }

echo '<br /><br /><a href="..">Return</a>';

    closedir($handle);

}

?>



and simply use $count to list the overall number of files.

singh206 at gmail dot com
16-Nov-2007 06:15


Oops, made a few syntactical errors in the last example of getting only the final directory paths from a root dir.  PHP 4 OO.



    var $rootDir = '/SOME DIRECTORY';

    

    print_r($this->getFinalDirs($this->rootDir));    

    

    function getFinalDirs($root)

    {

        return $this->getNext($root);

    }

    

    function getNext($path)

    {

        static $dirs = array();

        $handle = opendir($path);

        if($handle)

        {

            while (false!==($dir=readdir($handle)))

            {

                if ($dir!='.'&&$dir!='..'&& $dir!='.DS_Store')

                {

                    if(is_dir($path.'/'.$dir))

                    {

                        $this->getNext($path.'/'.$dir);

                    } else

                    {

                        array_push($dirs, $path);

                        break;

                    }

                }

            }

        }

        return $dirs;

    }

Anonymous
15-Nov-2007 12:54


for ( $files = array(); ( $file = readdir( $handle )) !== false; $files[] = $file );

skysama at googles_email dot com
13-Sep-2007 02:23


Yet another view files by extension



/* NOTE:

 *  /a-d = do not include directories

 *  /b   = show files in bare mode ( no dates or filesize )

 */



<?php

$dir = '.\\img\\';    // reminder: escape your slashes

$filetype = "*.png";

$filelist = shell_exec( "dir {$dir}{$filetype} /a-d /b" );

$file_arr = explode( "\n", $filelist );

array_pop( $file_arr ); // last line is always blank

print_r( $file_arr );

?>

minisprinter (at) naver (dot) com
21-Aug-2007 08:09


The following code is a bit nasty, it can be used to remove all files generated by apache.



You're not a root user on a system, but you sometimes need to remove all files generated by apache in a certain directory. You may use this after replacing 'bbs' at the bottom with 'directory' you want.



It tries to remove all files in a directory, but it can't unless it has an ownership. it doesn't check the ownership or permission.



<?php



function remove($dirname = '.')

{

        if (is_dir($dirname))

        {

                echo "$dirname is a directory.<br />";



                if ($handle = @opendir($dirname))

                {

                        while (($file = readdir($handle)) !== false)

                        {

                                if ($file != "." && $file != "..")

                                {

                                        echo "$file<br />";



                                        $fullpath = $dirname . '/' . $file;



                                        if (is_dir($fullpath))

                                        {

                                                remove($fullpath);

                                                @rmdir($fullpath);

                                        }

                                        else

                                        {

                                                @unlink($fullpath);

                                        }

                                }

                        }

                        closedir($handle);

                }

        }

}



remove('bbs');



?>

nullbyte at hotmail dot com
20-Aug-2007 04:06


I haven't tested this yet, but it seems like it'll do just fine if you need files of a certain extension:



$dh = opendir($options['inputDir']);

$files = array();

while (($filename = readdir($dh)) !== false)

{

    if (substr($filename, strrpos($filename, '.')) == $options['inputExt'])

    {

        $files[] = $filename;

    }

}

closedir($dh);

moehbass at gmail dot com
13-Jul-2007 02:25


PLease disregard my last two posts. For the last one, if you're looking for files with .php extension, you also get files with any extension that ends with 'p'. I wrote the function in quite a haste and now I am too busy to fix it - so don't use it! it's no good.

moehbass at gmail dot com
13-Jul-2007 12:53


Sorry,

In my last post, if you only want to list files with certain extensions, then see how many letters this extension is, add one to it, and subtract it from the strlen of the file name. Review script below for details.

moehbass at gmail dot com
13-Jul-2007 12:27


Responding to:

johan dot mickelin at gmail dot com

31-May-2007 07:52

-------------------------------------------------------

If you want to list only a certain filetype, this case only jpg and gif files in an image directory



$dir = opendir ("../images");

        while (false !== ($file = readdir($dir))) {

                if (strpos($file, '.gif',1)||strpos($file, '.jpg',1) ) {

                    echo "$file <br />";

                }

        }

-----------------------------------------------------------------



This function would also echo files that have .gif or .jpg in their names such as myFile.gif.php (I don't know why I'd name a file like that, but I am just making a point, that's all folks!)

Perhaps a more exact way is to do the following:

...

while (false !== ($file = readdir($dir))) {

        $lenOfFileName = strlen($file);

        $extOffsetPos = $lenOfFileName - 5;

         if (strpos($file, '.gif', $extOffsetPos) || 

             strpos($file, '.jpg',$extOffsetPos) ) {

                    echo "$file <br />";

          }

...

If your extensions are more than three letters, then increase the 5 to 6 (e.g. aspx) to 7 (e.g. php51) or whatever.

johan dot mickelin at gmail dot com
01-Jun-2007 11:52


If you want to list only a certain filetype, this case only jpg and gif files in an image directory



$dir = opendir ("../images"); 

        while (false !== ($file = readdir($dir))) {

                if (strpos($file, '.gif',1)||strpos($file, '.jpg',1) ) {

                    echo "$file <br />";

                }

        }

schursin at gmail[deleteme] dot com
28-May-2007 10:42

(Qube#php@Efnet)
16-May-2007 12:36


<?php



// Sample function to recursively return all files within a directory.

// http://www.pgregg.com/projects/php/code/recursive_readdir.phps



Function listdir($start_dir='.') {



  $files = array();

  if (is_dir($start_dir)) {

    $fh = opendir($start_dir);

    while (($file = readdir($fh)) !== false) {

      # loop through the files, skipping . and .., and recursing if necessary

      if (strcmp($file, '.')==0 || strcmp($file, '..')==0) continue;

      $filepath = $start_dir . '/' . $file;

      if ( is_dir($filepath) )

        $files = array_merge($files, listdir($filepath));

      else

        array_push($files, $filepath);

    }

    closedir($fh);

  } else {

    # false if the function was called with an invalid non-directory argument

    $files = false;

  }



  return $files;



}



$files = listdir('.');

print_r($files);

?>

(Qube#php@Efnet)
14-May-2007 06:41


Here is an updated version of preg_find() [which has been linked from the glob() man page for years] - this function should provide most of what you want back from reading files, directories, different sorting methods, recursion, and perhaps most powerful of all the ability to pattern match with a PCRE regex.



You can get preg_find here: http://www.pgregg.com/projects/php/preg_find/preg_find.php.txt

or if you prefer colourful .phps format: http://www.pgregg.com/projects/php/preg_find/preg_find.phps

or scoll down to the end of this note.



I wrote several examples on how to use it on my blog at: http://www.pgregg.com/forums/viewtopic.php?tid=73



simple glob() type replacement:

$files = preg_find('/./', $dir);



recursive?

$files = preg_find('/./', $dir, PREG_FIND_RECURSIVE);



pattern match? find all .php files:

$files = preg_find('/\.php$/D', $dir, PREG_FIND_RECURSIVE);



sorted alphabetically?

$files = preg_find('/\.php$/D', $dir, PREG_FIND_RECURSIVE|PREG_FIND_SORTKEYS);



sorted in by filesize, in descending order?

$files = preg_find('/./', $dir,

  PREG_FIND_RECURSIVE|PREG_FIND_RETURNASSOC |PREG_FIND_SORTFILESIZE|PREG_FIND_SORTDESC);

$files=array_keys($files);



sorted by date modified?

$files = preg_find('/./', $dir,

  PREG_FIND_RECURSIVE|PREG_FIND_RETURNASSOC |PREG_FIND_SORTMODIFIED);

$files=array_keys($files);



Ok, the PHP note says my note is too long, so please click on one of the above links to get it.

phpwizard-at-pech-dot-cz
05-Jul-2002 05:22


It should work, but it'll be better to read section 13.1.3 Cache-control Mechanisms of RFC 2616 available at http://rfc.net/rfc2616.html before you start with confusing proxies on the way from you and the client.



Reading it is the best way to learn how proxies work, what should you do to modify cache-related headers of your documents and what you should never do again. :-)



And of course not reading RFCs is the best way to never learn how internet works and the best way to behave like Microsoft corp.



Have a nice day!

Jirka Pech

fridh at gmx dot net
10-Apr-2002 09:41


Someone mentioned the infinite recursion when a symbolic link was found...



tip: is_link() is a nice function :)

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rewinddir

" width="11" height="7"/>

opendir

Last updated: Fri, 11 Apr 2008