ParagonIE_Sodium_Core_Util::bin2hex( string $binaryString ): string

70    public static function bin2hex($binaryString)71    {72        /* Type checks: */73        if (!is_string($binaryString)) {74            throw new TypeError('Argument 1 must be a string, ' . gettype($binaryString) . ' given.');75        }76 77        $hex = '';78        $len = self::strlen($binaryString);79        for ($i = 0; $i < $len; ++$i) {80            /** @var array<int, int> $chunk */81            $chunk = unpack('C', $binaryString[$i]);82            /** @var int $c */83            $c = $chunk[1] & 0xf;84            /** @var int $b */85            $b = $chunk[1] >> 4;86            $hex .= pack(87                'CC',88                (87 + $b + ((($b - 10) >> 8) & ~38)),89                (87 + $c + ((($c - 10) >> 8) & ~38))90            );91        }92        return $hex;93    }