xattr_supported
(PECL xattr >= 1.0.0)
xattr_supported — Check if filesystem supports extended attributes
说明
xattr_supported(string$filename, int $flags = 0): bool
This functions checks if the filesystem holding the given file supports extended attributes. Read access to the file is required.
参数
filename
The path of the tested file.
flags
XATTR_DONTFOLLOW返回值
This function returns true if filesystem supports extended attributes,
false if it doesn't and null if it can't be determined (for example
wrong path or lack of permissions to file).
范例
示例 #1 xattr_supported() example
The following code checks if we can use extended attributes.
<?php
$file = 'some_file';
if (xattr_supported($file)) {
/* ... make use of some xattr_* functions ... */
}
?>
参见
xattr_get() - Get an extended attribute xattr_list() - Get a list of extended attributes
User Contributed Notes
There are no user contributed notes for this page.官方地址：https://www.php.net/manual/en/function.xattr-supported.php