disk_free_space返回目录可用空间，这个可根据你当关硬盘的空间大小来判断
用法
disk_free_space($path);
注: 本函数不能作用于远程文件，被检查的文件必须通过服务器的文件系统访问。
本函数功能
本函数将根据相应的文件系统或磁盘分区返回可用的字节数
好了实例是很简单我们就来看看实例吧.
代码如下:
$jb51net = disk_free_space("/");
echo $jb51net;
?>
代码如下:
// $df 包含根目录下可用的字节数
$df = disk_free_space("/");
//在 Windows 下:
disk_free_space("C:");
disk_free_space("D:");
?>
返回的是文件系统或磁盘分区返回可用的字节数
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