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<?php

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class WPML_UUID {

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/**

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* @param string $object_id

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* @param string $object_type

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* @param int $timestamp

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* @return string

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public function get( $object_id, $object_type, $timestamp = null ) {

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$timestamp = $timestamp ? $timestamp : time();

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$name = $object_id . ':' . $object_type . ':' . $timestamp;

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return $this->get_uuid_v5( $name, wpml_get_site_id() );

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}

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/**

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* RFC 4122 compliant UUIDs.

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* The RFC 4122 specification defines a Uniform Resource Name namespace for

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* UUIDs (Universally Unique Identifier), also known as GUIDs (Globally

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* Unique Identifier). A UUID is 128 bits long, and requires no central

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* registration process.

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* @package UUID

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* @license https://www.gnu.org/licenses/gpl-2.0.txt GPLv2

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* @author bjornjohansen

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* @see https://bjornjohansen.no/uuid-as-wordpress-guid

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* RFC 4122 compliant UUID version 5.

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* @param string $name The name to generate the UUID from.

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* @param string $ns_uuid Namespace UUID. Default is for the NS when name string is a URL.

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* @return string The UUID string.

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public function get_uuid_v5( $name, $ns_uuid = '6ba7b811-9dad-11d1-80b4-00c04fd430c8' ) {

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// Compute the hash of the name space ID concatenated with the name.

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$hash = sha1( $ns_uuid . $name );

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// Intialize the octets with the 16 first octets of the hash, and adjust specific bits later.

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$octets = str_split( substr( $hash, 0, 16 ), 1 );

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* Set version to 0101 (UUID version 5).

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* Set the four most significant bits (bits 12 through 15) of the

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* time_hi_and_version field to the appropriate 4-bit version number

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* from Section 4.1.3.

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* That is 0101 for version 5.

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* time_hi_and_version is octets 6–7

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$octets[6] = chr( ord( $octets[6] ) & 0x0f | 0x50 );

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* Set the UUID variant to the one defined by RFC 4122, according to RFC 4122 section 4.1.1.

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* Set the two most significant bits (bits 6 and 7) of the

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* clock_seq_hi_and_reserved to zero and one, respectively.

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* clock_seq_hi_and_reserved is octet 8

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$octets[8] = chr( ord( $octets[8] ) & 0x3f | 0x80 );

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// Hex encode the octets for string representation.

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$octets = array_map( 'bin2hex', $octets );

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// Return the octets in the format specified by the ABNF in RFC 4122 section 3.

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return vsprintf( '%s%s-%s-%s-%s-%s%s%s', str_split( implode( '', $octets ), 4 ) );

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}

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}

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