it is basically an alias gmp_mod.
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_div_r — Remainder of the division of numbers
Calculates remainder of the integer division of
n by d. The
remainder has the sign of the n argument,
if not zero.
nThe number being divided.
可以是一个 GMP 数据 resouce，或一个可以转换为数值的字符串。
d
The number that n is being divided by.
可以是一个 GMP 数据 resouce，或一个可以转换为数值的字符串。
round
See the gmp_div_q() function for description
of the round argument.
The remainder, as a GMP number.
Example #1 gmp_div_r() example
<?php
$div = gmp_div_r("105", "20");
echo gmp_strval($div) . "\n";
?>
以上例程会输出：
5
it is basically an alias gmp_mod.