(PHP 4 >= 4.0.4, PHP 5)
gmp_pow — Raise number into power
Raise base into power exp.
The base number.
可以是一个 GMP 数据 resouce，或一个可以转换为数值的字符串。
The positive power to raise the base.
The new (raised) number, as a GMP number. The case of 0^0 yields 1.
Example #1 gmp_pow() example 以上例程会输出：
<?php
$pow1 = gmp_pow("2", 31);
echo gmp_strval($pow1) . "
";
$pow2 = gmp_pow("0", 0);
echo gmp_strval($pow2) . "
";
$pow3 = gmp_pow("2", -1); // Negative exp, generates warning
echo gmp_strval($pow3) . "
";
?>
2147483648
1