php man page for gmp_sub

GMP_SUB(3)								 1								GMP_SUB(3)

gmp_sub - Subtract numbers

SYNOPSIS
       GMP gmp_sub (GMP  $a, GMP  $b)

DESCRIPTION
	Subtracts $b from $a and returns the result.

PARAMETERS
	      o $a
		-  The	number being subtracted from. 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 $b
		- The number subtracted from $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
	A GMP number resource in PHP 5.5 and earlier, or a GMP object in PHP 5.6 and later.

EXAMPLES
       Example #1

	      gmp_sub(3) example

	      <?php
	      $sub = gmp_sub("281474976710656", "4294967296"); // 2^48 - 2^32
	      echo gmp_strval($sub) . "
";
	      ?>

	      The above example will output:

	      281470681743360

PHP Documentation Group 														GMP_SUB(3)