/**
* Version 5 UUIDs are named based. They require a namespace (another
* valid UUID) and a value (the name). Given the same namespace and
* name, the output is always the same.
*
* @param string namespace
* @param string key name
* @return string
*/
public static function v5($namespace, $name)
{
if (!UUID::valid($namespace)) {
// All namespaces must be valid UUIDs
return FALSE;
}
// Get namespace in binary format
$nstr = UUID::bin($namespace);
// Calculate hash value
$hash = sha1($nstr . $name);
return sprintf('%08s-%04s-%04x-%04x-%12s', substr($hash, 0, 8), substr($hash, 8, 4), hexdec(substr($hash, 12, 4)) & 0xfff | 0x5000, hexdec(substr($hash, 16, 4)) & 0x3fff | 0x8000, substr($hash, 20, 12));
}
