Generate a unique ID.
@return string Returns the unique identifier, as a string.
5187
public static function uniqid()
    {
        static $n = 0;
        return str_shuffle(
            md5(
                str_shuffle(
                    microtime(true) . chr(mt_rand(0, 0xFF))
                    . Daemon::$process->getPid() . chr(mt_rand(0, 0xFF))
                    . (++$n) . mt_rand(0, mt_getrandmax())
                )
            )
        );
    }
495560
public function getId() {
    $str = "[".$this->combineOperator."] ".$this->type.".".$this->attribute.
            " ".$this->operator.(is_array($this->value) ? sizeof($this->value) : "");
    return $str;
  }
326165
public function generate()
    {
        $str     = '';
        $keysize = strlen($this->_alphabet);

        for ($i = 0; $i < $this->_length; ++$i) {
            $str .= $this->_alphabet[\Sodium\randombytes_uniform($keysize)];
        }

        return $str;
    }
796761
final private function generateUuid()
    {
        return sprintf(
            '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
            // 32 bits for "time_low"
            mt_rand(0, 0xffff),
            mt_rand(0, 0xffff),
            // 16 bits for "time_mid"
            mt_rand(0, 0xffff),
            // 16 bits for "time_hi_and_version",
            // four most significant bits holds version number 4
            mt_rand(0, 0x0fff) | 0x4000,
            // 16 bits, 8 bits for "clk_seq_hi_res",
            // 8 bits for "clk_seq_low",
            // two most significant bits holds zero and one for variant DCE1.1
            mt_rand(0, 0x3fff) | 0x8000,
            // 48 bits for "node"
            mt_rand(0, 0xffff),
            mt_rand(0, 0xffff),
            mt_rand(0, 0xffff)
        );
    }
273151
public function generateUuid()
    {
        $format = '%04x%04x-%04x-%04x-%04x-%04x%04x%04x';

        return sprintf(
            $format,
            // 32 bits for "time_low"
            mt_rand(0, 0xffff),
            mt_rand(0, 0xffff),
            // 16 bits for "time_mid"
            mt_rand(0, 0xffff),
            // 16 bits for "time_hi_and_version",
            // four most significant bits holds version number 4
            mt_rand(0, 0x0fff) | 0x4000,
            // 16 bits, 8 bits for "clk_seq_hi_res",
            // 8 bits for "clk_seq_low",
            // two most significant bits holds zero and one for variant DCE1.1
            mt_rand(0, 0x3fff) | 0x8000,
            // 48 bits for "node"
            mt_rand(0, 0xffff),
            mt_rand(0, 0xffff),
            mt_rand(0, 0xffff)
        );
    }
655003
protected function generateUUID()
        {
        $uuid = null;
        if ($this->useUUIDs) {
            $sql    = 'SELECT UUID() as id';
            $result = $this->database->fetchAssoc($sql);
            $uuid   = $result['id'];
        }
        return $uuid;
    }
624384
public function getIdStringAttribute()
    {
        $key = $this->getKeyName();
        return (property_exists($this, 'uuidOptimization') && $this::$uuidOptimization)
            ? self::toNormal($this->attributes[$key]) : bin2hex($this->attributes[$key]);
    }
472143
public function getId()
    {
        if (!$this->id) {
            $this->setId(sha1($this->getDomain() . $this->getKey()));
        }

        return $this->id;
    }
706238
def gen_unique_id():
    
    # Workaround for http://bugs.python.org/issue4607
    if ctypes and _uuid_generate_random:
        buffer = ctypes.create_string_buffer(16)
        _uuid_generate_random(buffer)
        return str(UUID(bytes=buffer.raw))
    return str(uuid4())
5050
private function genUID() {
        // HTTP_CLIENT_IP and HTTP_X_FORWARDE‌​D_FOR can be forged.
        // REMOTE_ADDR is the same for all clients connected to a proxy.
        $ip=@$_SERVER['HTTP_CLIENT_IP'].@$_SERVER['HTTP_X_FORWARDE‌​D_FOR'].@$_SERVER['REMOTE_ADDR'];
        // HTTP_USER_AGENT could be forge.
        $browser=@$_SERVER['HTTP_USER_AGENT'];
        return md5($ip.$browser);
    }
1365021
public function getId()
    {
        if ( empty( $this->id ) )
        {
            if ( $this->getColumnsUseTranslation() )
            {
                $id = trim( $this->getColumnTranslatePrefix() . '.' .
                            $this->getColumnTranslatePostfix(), '.' );

                if ( ! empty( $id ) )
                {
                    return str_replace( '.', '_', $id );
                }
            }

            $this->id = String::generateRandom();
        }

        return $this->id;
    }
272465
public function generateId()
    {
        $data = openssl_random_pseudo_bytes(16);
        $data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100
        $data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10

        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
    }
336272
public static function generateId()
    {
        while ($rand = rand(1, PHP_INT_MAX)) {
            if (!in_array($rand, static::$generatedIds, true)) {
                static::$generatedIds[] = $rand;
                return $rand;
            }
        }
    }
916788
public function _generateUUIDString() {
        return sprintf("%08x%08x%08x%08x",
            $this->_util->randInt32(),
            $this->_util->randInt32(),
            $this->_util->randInt32(),
            $this->_util->randInt32()
        );
    }
629888
public function getID()
    {
        $idAttribute = $this->idAttribute;
        return (is_string($idAttribute) && !empty($idAttribute)) ? $this->$idAttribute : null;
    }
1003266
public function getId() {
		$options = $this->getOptions();
		$id = elgg_extract('list_id', $options);
		if (!$id) {
			$id = md5($this->getBaseURL());
		}
		return $id;
	}
803561
public function generateID()
    {
        $id = $this->getID();
        $fmt_string = "%08s";
        if (is_array($id))
            $id = implode("-", $id);

        if (empty($id))
            throw new Exception("Cannot generate an ID for an empty object");

        $id = substr(sha1($id), 0, 10);
        $acl_class = $this->getACLClass();

        return $acl_class . "#" . $id;
    }