php man page for gmp_intval

GMP_INTVAL(3)								 1							     GMP_INTVAL(3)

gmp_intval - Convert GMP number to integer

SYNOPSIS
       int gmp_intval (GMP  $gmpnumber)

DESCRIPTION
	This function converts GMP number into native PHP integers.

PARAMETERS
	      o $gmpnumber
		-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 value of $gmpnumber.

EXAMPLES
       Example #1

	      gmp_intval(3) example

	      <?php
	      // displays correct result
	      echo gmp_intval("2147483647") . "
";

	      // displays wrong result, above PHP integer limit
	      echo gmp_intval("2147483648") . "
";

	      // displays correct result
	      echo gmp_strval("2147483648") . "
";
	      ?>

	      The above example will output:

	      2147483647
	      2147483647
	      2147483648

NOTES
       Warning

	       This function returns a useful result only if the number actually fits the PHP integer (i.e., signed long type). If you	want  just
	      to print the GMP number, use gmp_strval(3).

PHP Documentation Group 													     GMP_INTVAL(3)