134     public function __construct($x = 0, $base = 10)  argument
145         if (empty($x) && (abs($base) != 256 || $x !== '0')) {
152                 if ($base == -256 && (ord($x[0]) & 0x80)) {
153                     $this->value = ~$x;
156                     $this->value = $x;
169                 if ($base > 0 && $x[0] == '-') {
171                     $x = substr($x, 1);
174                 $x = preg_replace('#^(?:0x)?([A-Fa-f0-9]*).*#', '$1', $x);
177                 if ($base < 0 && hexdec($x[0]) >= 8) {
179                     $x = Hex::encode(~Hex::decode($x));
182                 $this->value = $x;
195                 $this->value = preg_replace('#(?<!^)(?:-).*|(?<=^|-)0*|[^-0-9].*#', '', $x);
203                 if ($base > 0 && $x[0] == '-') {
205                     $x = substr($x, 1);
208                 $x = preg_replace('#^([01]*).*#', '$1', $x);
210                 $temp = new static(Strings::bits2bin($x), 128 * $base); // ie. either -16 or +16
334         $x = $x->compare(static::$zero[static::class]) < 0 ? $x->add($n) : $x;
336 …pare(static::$zero[static::class]) < 0 ? $this->normalize($n->subtract($x)) : $this->normalize($x);
504      * @param string $x
508     protected static function base256_lshift(&$x, $shift)  argument
518         for ($i = strlen($x) - 1; $i >= 0; --$i) {
519             $temp = ord($x[$i]) << $shift | $carry;
520             $x[$i] = chr($temp);
524         $x = $carry . $x . str_repeat(chr(0), $num_bytes);
662      * @param Engine $x
668     protected static function slidingWindow(Engine $x, Engine $e, Engine $n, $class)  argument
689         $powers[1] = static::prepareReduce($x->value, $n_value, $class);
787         $x = static::randomRange($min, $max);
789         return static::randomRangePrimeInner($x, $min, $max);
864      * @param Engine $x
869     protected static function randomRangePrimeInner(Engine $x, Engine $min, Engine $max)  argument
875         $x->make_odd();
876         if ($x->compare($max) > 0) {
881             $x = clone $min;
882             $x->make_odd();
885         $initial_x = clone $x;
888             if ($x->isPrime()) {
889                 return $x;
892             $x = $x->add(static::$two[static::class]);
894             if ($x->compare($max) > 0) {
895                 $x = clone $min;
896                 if ($x->equals(static::$two[static::class])) {
897                     return $x;
899                 $x->make_odd();
902             if ($x->equals($initial_x)) {
1230      * @param Engine $x
1233     protected function bitwiseAndHelper(Engine $x)  argument
1236         $right = $x->toBytes(true);
1249      * @param Engine $x
1252     protected function bitwiseOrHelper(Engine $x)  argument
1255         $right = $x->toBytes(true);
1268      * @param Engine $x
1271     protected function bitwiseXorHelper(Engine $x)  argument
1274         $right = $x->toBytes(true);