php man page for gmp_pow

GMP_POW(3)								 1								GMP_POW(3)

gmp_pow - Raise number into power

SYNOPSIS
       GMP gmp_pow (GMP  $base, int  $exp)

DESCRIPTION
	Raise $base into power $exp.

PARAMETERS
	      o $base
		-  The	base  number.  Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string
		provided that it is possible to convert the latter to a number.

	      o $exp
		- The positive power to raise the $base.

RETURN VALUES
	The new (raised) number, as a GMP number. The case of 0^0 yields 1.

EXAMPLES
       Example #1

	      gmp_pow(3) example

	      <?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) . "
";
	      ?>

	      The above example will output:

	      2147483648
	      1

PHP Documentation Group 														GMP_POW(3)