disk_free_space

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

disk_free_space — Restituisce lo spazio disponibile nella directory

Descrizione

disk_free_space(string $directory): float

Data una stringa contenente una directory, questa funzione restituirà il numero di byte disponibili nel corrispondente filesystem o nella partizione corrispondente.

Example #1 Esempio disk_free_space()

<?php
// $df contiene il numero di byte disponibili in "/"
$df = disk_free_space("/"); 

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

Nota: Questa funzione non opererà su file remoti perché il file che deve essere esaminato deve essere accessibile attraverso il filesysmte del server.

Vedere anche disk_total_space()

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User Contributed Notes 9 notes

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wiede at gmx dot net ¶

13 years ago


Transformation is possible WITHOUT using loops:

<?php 
    $bytes = disk_free_space("."); 
    $si_prefix = array( 'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB' );
    $base = 1024;
    $class = min((int)log($bytes , $base) , count($si_prefix) - 1);
    echo $bytes . '<br />';
    echo sprintf('%1.2f' , $bytes / pow($base,$class)) . ' ' . $si_prefix[$class] . '<br />';
?>

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Anonymous ¶

10 years ago


$si_prefix = array( 'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB' );

you are missing the petabyte after terabyte

 'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB' 

should look like

 'B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'

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sam ¶

15 years ago


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

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Nitrogen ¶

17 years ago


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.

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root at mantoru dot de ¶

16 years ago


Note that disk_free_space() does an open_basedir check.

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Jawira Portugal ¶

2 years ago


This is not documented yet. 
If $directory is invalid, then disk_free_space() will return false and ALSO throw a Warning: "disk_free_space(): No such file or directory"

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-1

somedude ¶

8 years ago


With respect to Linux filesystems, I'll point out that this function returns the space available in the current volume or mountpoint, not the total physical disk space.  That is, this function used on the '/root' volume shows the free space in /root, which is different from '/home', and so on.

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-11

Matthieu S ¶

7 years ago


On Windows, this also works with distant files, by using their full network path.

For instance, this will give the % of free disk space on the share "dir" from remote host "server" :
<?php
$path = "\\\\server\\dir";
echo(floor(100 * disk_free_space($disk) / disk_total_space($disk)));
?>

It can also work with drive letters mapped to a network path in certain cases.

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-13

pavel at sunhater dot com ¶

5 years ago


<?php

function size($size, array $options=null) {

    $o = [
        'binary' => false,
        'decimalPlaces' => 2,
        'decimalSeparator' => '.',
        'thausandsSeparator' => '',
        'maxThreshold' => false, // or thresholds key
        'sufix' => [
            'thresholds' => ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'],
            'decimal' => ' {threshold}B',
            'binary' => ' {threshold}iB'
        ]
    ];

    if ($options !== null)
        $o = array_replace_recursive($o, $options);

    $count = count($o['sufix']['thresholds']);
    $pow = $o['binary'] ? 1024 : 1000;

    for ($i = 0; $i < $count; $i++)

        if (($size < pow($pow, $i + 1)) ||
            ($i === $o['maxThreshold']) ||
            ($i === ($count - 1))
        )
            return

                number_format(
                    $size / pow($pow, $i),
                    $o['decimalPlaces'],
                    $o['decimalSeparator'],
                    $o['thausandsSeparator']
                ) .

                str_replace(
                    '{threshold}',
                    $o['sufix']['thresholds'][$i],
                    $o['sufix'][$o['binary'] ? 'binary' : 'decimal']
                );
}

var_dump(size(disk_free_space('/')));
// string(8) "14.63 GB"
var_dump(size(disk_free_space('/'), ['binary' => true]));
// string(9) "13.63 GiB"
var_dump(size(disk_free_space('/'), ['maxThreshold' => 2]));
// string(11) "14631.90 MB"
var_dump(size(disk_free_space('/'), ['binary' => true, 'maxThreshold' => 2]));
// string(12) "13954.07 MiB"

?>

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