(PHP 4 >= 4.0.4, PHP 5)
gmp_sqrtrem — Square root with remainder
Calculate the square root of a number, with remainder.
The number being square rooted.
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
Returns array where first element is the integer square root of a and the second is the remainder (i.e., the difference between a and the first element squared).
Example#1 gmp_sqrtrem() example
<?php
list($sqrt1, $sqrt1rem) = gmp_sqrtrem("9");
list($sqrt2, $sqrt2rem) = gmp_sqrtrem("7");
list($sqrt3, $sqrt3rem) = gmp_sqrtrem("1048576");
echo gmp_strval($sqrt1) . ", " . gmp_strval($sqrt1rem) . "\n";
echo gmp_strval($sqrt2) . ", " . gmp_strval($sqrt2rem) . "\n";
echo gmp_strval($sqrt3) . ", " . gmp_strval($sqrt3rem) . "\n";
?>
上例将输出：
3, 0 2, 3 1024, 0