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    xattr_get

    (PECL xattr >= 0.9.0)

    xattr_get — Get an extended attribute

    Description

    xattr_get(string $filename, string $name, int $flags = 0): string

    This function gets the value of an extended attribute of a file.

    Extended attributes have two different namespaces: user and root. The user namespace is available to all users, while the root namespace is available only to users with root privileges. xattr operates on the user namespace by default, but this can be changed with the flags parameter.

    Parameters

    filename

    The file from which we get the attribute.

    name

    The name of the attribute.

    flags

    Supported xattr flags
    XATTR_DONTFOLLOW Do not follow the symbolic link but operate on symbolic link itself.
    XATTR_ROOT Set attribute in root (trusted) namespace. Requires root privileges.

    Return Values

    Returns a string containing the value or false if the attribute doesn't exist.

    Examples

    Example #1 Checks if system administrator has signed the file

    <?php
    $file     = '/usr/local/sbin/some_binary';
    $signature = xattr_get($file, 'Root signature', XATTR_ROOT);

    /* ... check if $signature is valid ... */

    ?>

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