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Base conversion: bindec(), decbin(), dechex(), decoct(), hexdec(), octdec(), and base_convert()
int bindec ( string binary_string)
string decbin ( int number)
string dechex ( int number)
string decoct ( int number)
int hexdec ( string hex_string)
int octdec ( string octal_string)
string base_convert ( string number, int from_base, int to_base)