(PHP 4 >= 4.0.4, PHP 5)
gmp_sqrt — Calculate square root
Calculates square root of a .
It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.
The integer portion of the square root, as a GMP number.
Example #1 gmp_sqrt() example
<?php
$sqrt1 = gmp_sqrt("9");
$sqrt2 = gmp_sqrt("7");
$sqrt3 = gmp_sqrt("1524157875019052100");
echo gmp_strval($sqrt1) . "\n";
echo gmp_strval($sqrt2) . "\n";
echo gmp_strval($sqrt3) . "\n";
?>
上例将输出：
3 2 1234567890