The GMP class

Introduction

(PHP 5 >= 5.6.0, PHP 7, PHP 8)

A GMP number. These objects support overloaded arithmetic, bitwise and comparison operators.

Note:
No object-oriented interface is provided to manipulate GMP objects. Please use the procedural GMP API.

class GMP implements Serializable {

}

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https://www.php.net/manual/en/class.gmp.php