https://bugs.php.net/bug.php?id=50283
PHP :: Bug #50283 :: allow base in gmp_strval to use full range: 2 to 62, and -2 to -36
https://www.php.net/manual/uk/function.gmp-strval.php
PHP: gmp_strval - Manual
Convert GMP number to string
phpgmpmanual
https://www.php.net/manual/zh/function.gmp-strval.php
PHP: gmp_strval - Manual
Convert GMP number to string
phpgmpmanual