(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_init — Create GMP number
gmp_init ( int|string $num [, int $base = 0 ] ) : GMP
Creates a GMP number from an integer or string.
num
An integer or a string. The string representation can be decimal, hexadecimal or octal.
base
The base.
The base may vary from 2 to 36. If base is 0 (default value), the actual base is determined from the leading characters: if the first two characters are 0x or 0X, hexadecimal is assumed, otherwise if the first character is "0", octal is assumed, otherwise decimal is assumed.
A GMP object.
Example #1 Creating GMP number
<?php
$a = gmp_init(123456);
$b = gmp_init("0xFFFFDEBACDFEDF7200");
?> Note:
It is not necessary to call this function in order to use integers or strings in place of GMP numbers in GMP functions (such as with gmp_add()). Function arguments are automatically converted to GMP numbers, if such conversion is possible and needed, using the same rules as gmp_init().
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https://www.php.net/manual/en/function.gmp-init.php