disk_free_space

(PHP 4 >= 4.1.0, PHP 5)

disk_free_space — Returns available space in directory

Description

float disk_free_space ( string $directory )

Given a string containing a directory, this function will return the number of bytes available on the corresponding filesystem or disk partition.

Parameters

directory: A directory of the filesystem or disk partition.

Note: Given a file name instead of a directory, the behaviour of the function is unspecified and may differ between operating systems and PHP versions.

Return Values

Returns the number of available bytes as a float.

Examples

Example #1 disk_free_space() example


<?php
// $df contains the number of bytes available on "/"
$df = disk_free_space("/");

// On Windows:
disk_free_space("C:");
disk_free_space("D:");
?>

Notes

Note: This function will not work on remote files as the file to be examined must be accessible via the server's filesystem.


Nice, but please be aware of the prefixes.



SI specifies a lower case 'k' as 1'000 prefix.

It doesn't make sense to use an upper case 'K' as binary prefix,

while the decimal Mega (M and following) prefixes in SI are uppercase.

Furthermore, there are REAL binary prefixes since a few years.



Do it the (newest and recommended) "IEC" way:



KB's are calculated decimal; power of 10 (1000 bytes each)

KiB's are calculated binary; power of 2 (1024 bytes each).

The same goes for MB, MiB and so on...



Feel free to read:

http://en.wikipedia.org/wiki/Binary_prefix

rostvertol dot mil at gmail dot com
18-Feb-2008 09:27


A cleaner and more efficient way of making human readable file sizes:



<?php

function decodeSize( $bytes )

{

    $types = array( 'B', 'KB', 'MB', 'GB', 'TB' );

    for( $i = 0; $bytes >= 1024 && $i < ( count( $types ) -1 ); $bytes /= 1024, $i++ );

    return( round( $bytes, 2 ) . " " . $types[$i] );

}

?>

root at mantoru dot de
06-Dec-2007 06:25


Note that disk_free_space() does an open_basedir check.

Nitrogen
11-Jan-2007 03:50


Another easy way to convert bytes to human readable sizes would be this:



<?php

function HumanSize($Bytes)

{

  $Type=array("", "kilo", "mega", "giga", "tera", "peta", "exa", "zetta", "yotta");

  $Index=0;

  while($Bytes>=1024)

  {

    $Bytes/=1024;

    $Index++;

  }

  return("".$Bytes." ".$Type[$Index]."bytes");

}

?>



It simply takes the $Bytes and divides it by 1024 bytes untill it's no longer over or equal to 1024, meanwhile it increases the $Index to allocate which suffix belongs to the return (adding 'bytes' to the end to save some space).

You can easily modify it so it's shorter, but I made it so it's more clearer.



Nitrogen.

mixar at yandex dot ru
04-Dec-2006 01:33


This the right function is:



function formatSize($size){

    switch (true){

    case ($size > 1099511627776):

        $size /= 1099511627776;

        $suffix = 'TB';

    break;

    case ($size > 1073741824):

        $size /= 1073741824;

        $suffix = 'GB';

    break;

    case ($size > 1048576):

        $size /= 1048576;

        $suffix = 'MB';    

    break;

    case ($size > 1024):

        $size /= 1024;

        $suffix = 'KB';

        break;

    default:

        $suffix = 'B';

    }

    return round($size, 2).$suffix;

}

djneoform at gmail dot com
12-Jul-2006 05:13


List all drives, free space, total space and percentage free.



<?

    for ($i = 67; $i <= 90; $i++)

    {

        $drive = chr($i);

        if (is_dir($drive.':'))

        {

            $freespace             = disk_free_space($drive.':');

            $total_space         = disk_total_space($drive.':');

            $percentage_free     = $freespace ? round($freespace / $total_space, 2) * 100 : 0;

            echo $drive.': '.to_readble_size($freespace).' / '.to_readble_size($total_space).' ['.$percentage_free.'%]<br />';

        }

    }



    function to_readble_size($size)

    {

        switch (true)

        {

            case ($size > 1000000000000):

                $size /= 1000000000000;

                $suffix = 'TB';

                break;

            case ($size > 1000000000):

                $size /= 1000000000;

                $suffix = 'GB';

                break;

            case ($size > 1000000):

                $size /= 1000000;

                $suffix = 'MB';    

                break;

            case ($size > 1000):

                $size /= 1000;

                $suffix = 'KB';

                break;

            default:

                $suffix = 'B';

        }

        return round($size, 2).$suffix;

    }

?>

Ashraf M Kaabi
02-Mar-2005 06:38


and also you can know the used space , in this 


example :


<?


function disk_used_space($drive)


{


    return disk_total_space("$drive:") - disk_free_space("$drive:");


}





echo disk_used_space('C');


?>

aidan at php dot net
16-Oct-2004 03:49


To make human readable file sizes, see this function:





http://aidanlister.com/repos/v/function.size_readable.php

add a note

disk_total_space

dirname

Last updated: Fri, 06 Nov 2009