# ~~~ function base58_encode($string) { $alphabet = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ'; $base = strlen($alphabet); if (is_string($string) === false) { return false; } if (strlen($string) === 0) { return ''; } $bytes = array_values(unpack('C*', $string)); $decimal = $bytes[0]; for ($i = 1, $l = count($bytes); $i < $l; $i++) { $decimal = bcmul($decimal, 256); $decimal = bcadd($decimal, $bytes[$i]); } $output = ''; while ($decimal >= $base) { $div = bcdiv($decimal, $base, 0); $mod = bcmod($decimal, $base); $output .= $alphabet[$mod]; $decimal = $div; } if ($decimal > 0) { $output .= $alphabet[$decimal]; } $output = strrev($output); foreach ($bytes as $byte) { if ($byte === 0) { $output = $alphabet[0] . $output; continue; } break; } return (string) $output; } function base58_decode($base58) { if (is_string($base58) === false) { return false; } if (strlen($base58) === 0) { return ''; } $indexes = array_flip(str_split($this->alphabet)); $chars = str_split($base58); foreach ($chars as $char) { if (isset($indexes[$char]) === false) { return false; } } $decimal = $indexes[$chars[0]]; for ($i = 1, $l = count($chars); $i < $l; $i++) { $decimal = bcmul($decimal, $this->base); $decimal = bcadd($decimal, $indexes[$chars[$i]]); } $output = ''; while ($decimal > 0) { $byte = bcmod($decimal, 256); $output = pack('C', $byte) . $output; $decimal = bcdiv($decimal, 256, 0); } foreach ($chars as $char) { if ($indexes[$char] === 0) { $output = "\x00" . $output; continue; } break; } return $output; } ~~~