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<?php class WPML_UUID { /** * @param string $object_id * @param string $object_type * @param int $timestamp * * @return string */ public function get( $object_id, $object_type, $timestamp = null ) { $timestamp = $timestamp ? $timestamp : time(); $name = $object_id . ':' . $object_type . ':' . $timestamp; return $this->get_uuid_v5( $name, wpml_get_site_id() ); } /** * RFC 4122 compliant UUIDs. * * The RFC 4122 specification defines a Uniform Resource Name namespace for * UUIDs (Universally Unique Identifier), also known as GUIDs (Globally * Unique Identifier). A UUID is 128 bits long, and requires no central * registration process. * * @package UUID * @license https://www.gnu.org/licenses/gpl-2.0.txt GPLv2 * @author bjornjohansen * @see https://bjornjohansen.no/uuid-as-wordpress-guid * * RFC 4122 compliant UUID version 5. * * @param string $name The name to generate the UUID from. * @param string $ns_uuid Namespace UUID. Default is for the NS when name string is a URL. * * @return string The UUID string. */ public function get_uuid_v5( $name, $ns_uuid = '6ba7b811-9dad-11d1-80b4-00c04fd430c8' ) { // Compute the hash of the name space ID concatenated with the name. $hash = sha1( $ns_uuid . $name ); // Intialize the octets with the 16 first octets of the hash, and adjust specific bits later. $octets = str_split( substr( $hash, 0, 16 ), 1 ); /* * Set version to 0101 (UUID version 5). * * Set the four most significant bits (bits 12 through 15) of the * time_hi_and_version field to the appropriate 4-bit version number * from Section 4.1.3. * * That is 0101 for version 5. * time_hi_and_version is octets 6–7 */ $octets[6] = chr( ord( $octets[6] ) & 0x0f | 0x50 ); /* * Set the UUID variant to the one defined by RFC 4122, according to RFC 4122 section 4.1.1. * * Set the two most significant bits (bits 6 and 7) of the * clock_seq_hi_and_reserved to zero and one, respectively. * * clock_seq_hi_and_reserved is octet 8 */ $octets[8] = chr( ord( $octets[8] ) & 0x3f | 0x80 ); // Hex encode the octets for string representation. $octets = array_map( 'bin2hex', $octets ); // Return the octets in the format specified by the ABNF in RFC 4122 section 3. return vsprintf( '%s%s-%s-%s-%s-%s%s%s', str_split( implode( '', $octets ), 4 ) ); } }
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