it is basically an alias gmp_mod.
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_div_r — Remainder of the division of numbers
Calculates remainder of the integer division of
num1 by num2. The
remainder has the sign of the num1 argument,
if not zero.
num1The number being divided.
GMP 对象、int 或 string，可以按照跟在 gmp_init() 中使用字符串并自动检测 base（即当 base 等于 0 时）相同的逻辑将其解释为数字。
num2
The number that num1 is being divided by.
GMP 对象、int 或 string，可以按照跟在 gmp_init() 中使用字符串并自动检测 base（即当 base 等于 0 时）相同的逻辑将其解释为数字。
rounding_mode
See the gmp_div_q() function for description
of the rounding_mode argument.
The remainder, as a GMP number.
示例 #1 gmp_div_r() example
<?php
$div = gmp_div_r("105", "20");
echo gmp_strval($div) . "\n";
?>以上示例会输出：
5