PHP Manual
xattr 函数
Check if filesystem supports extended attributes

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

**Supported xattr flags**
`XATTR_DONTFOLLOW`	Do not follow the symbolic link but operate on symbolic link itself.

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

Example #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

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