php man page for disk_free_space

DISK_FREE_SPACE(3)							 1							DISK_FREE_SPACE(3)

disk_free_space - Returns available space on filesystem or disk partition

SYNOPSIS
       float disk_free_space (string  $directory)

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

PARAMETERS
	      o $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 sys-
		     tems and PHP versions.

RETURN VALUES
	Returns the number of available bytes as a float or FALSE on failure.

EXAMPLES
       Example #1

	      disk_free_space(3) 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:");
	      ?>

NOTES
       Note

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

SEE ALSO
       disk_total_space(3).

PHP Documentation Group 													DISK_FREE_SPACE(3)