disk_free_space()

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

返回目錄中的可用空間

說明disk_free_space(string$directory):float

給出一個包含有一個目錄的字符串，本函數將根據相應的文件系統或磁盤分區返回可用的字節數。

參數$directory文件系統目錄或者磁盤分區。Note:

如果指定了文件名而不是文件目錄，這個函數的行為將并不統一，會因操作系統和 PHP 版本而異。

返回值

以浮點返回可用的字節數，或者在失敗時返回FALSE。

范例

Example #1disk_free_space()例子<?php

// $df 包含根目錄下可用的字節數

$df = disk_free_space("/");

//在 Windows 下:

$df_c = disk_free_space("C:");

$df_d = disk_free_space("D:");

?>

注釋Note:此函數不能作用于遠程文件，被檢查的文件必須是可通過服務器的文件系統訪問的。

參見Transformation is possible WITHOUT using loops:

$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 . '
';

echo sprintf('%1.2f', $bytes / pow($base,$class)) . ' '. $si_prefix[$class] . '
';

?>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$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'Another easy way to convert bytes to human readable sizes would be this:

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.Note that disk_free_space() does an open_basedir check.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.<?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"

?>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" :

$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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