php man page for gmp_sqrt

GMP_SQRT(3)								 1							       GMP_SQRT(3)

gmp_sqrt - Calculate square root

SYNOPSIS
       GMP gmp_sqrt (GMP  $a)

DESCRIPTION
	Calculates square root of $a.

PARAMETERS
	      o $a
		-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.

RETURN VALUES
	The integer portion of the square root, as a GMP number.

EXAMPLES
       Example #1

	      gmp_sqrt(3) example

	      <?php
	      $sqrt1 = gmp_sqrt("9");
	      $sqrt2 = gmp_sqrt("7");
	      $sqrt3 = gmp_sqrt("1524157875019052100");

	      echo gmp_strval($sqrt1) . "
";
	      echo gmp_strval($sqrt2) . "
";
	      echo gmp_strval($sqrt3) . "
";
	      ?>

	      The above example will output:

	      3
	      2
	      1234567890

PHP Documentation Group 													       GMP_SQRT(3)