(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
disk_free_space — Returns available space on filesystem or disk partition
Given a string containing a directory, this function will return the number of bytes available on the corresponding filesystem or disk partition.
directoryA 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.
Returns the number of available bytes as a float
or false on failure.
Example #1 disk_free_space() example
<?php
// $df contains the number of bytes available on "/"
$df = disk_free_space("/");
// On Windows:
$df_c = disk_free_space("C:");
$df_d = disk_free_space("D:");
?>Note: This function will not work on remote files as the file to be examined must be accessible via the server's filesystem.
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 />';
?>$si_prefix = array( 'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB' );
you are missing the petabyte after terabyte
'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB'
should look like
'B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'Nice, but please be aware of the prefixes.
SI specifies a lower case 'k' as 1'000 prefix.
It doesn't make sense to use an upper case 'K' as binary prefix,
while the decimal Mega (M and following) prefixes in SI are uppercase.
Furthermore, there are REAL binary prefixes since a few years.
Do it the (newest and recommended) "IEC" way:
KB's are calculated decimal; power of 10 (1000 bytes each)
KiB's are calculated binary; power of 2 (1024 bytes each).
The same goes for MB, MiB and so on...
Feel free to read:
http://en.wikipedia.org/wiki/Binary_prefixAnother easy way to convert bytes to human readable sizes would be this:
<?php
function HumanSize($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.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"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.