disk_free_space -返回目录中的可用空间
disk_free_space -返回目录中的可用空间
disk_free_space
（ PHP 4中“ = 4.1.0 ， PHP 5中）
disk_free_space -返回目录中的可用空间
描述
浮法disk_free_space （字符串$目录）
鉴于一个字符串包含一个目录，该函数将返回的字节数提供相应的文件或分区。
参数
目录
目录的文件或分区。
注：由于文件名而不是一个目录，行为的功能不详，可能是不同的操作系统和PHP版本。
返回值
返回一些可用字节为float 。
实例
例如＃ 1 disk_free_space （ ）的例子
// $df contains the number of bytes available on "/"
$df = disk_free_space("/");
// On Windows:
disk_free_space("C:");
disk_free_space("D:");
?>
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