php man page for gmp_invert

GMP_INVERT(3)								 1							     GMP_INVERT(3)

gmp_invert - Inverse by modulo

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

DESCRIPTION
	Computes the inverse of $a modulo $b.

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.

	      o $b
		-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 on success or FALSE if an inverse does not exist.

EXAMPLES
       Example #1

	      gmp_invert(3) example

	      <?php
	      echo gmp_invert("5", "10"); // no inverse, outputs nothing, result is FALSE
	      $invert = gmp_invert("5", "11");
	      echo gmp_strval($invert) . "
";
	      ?>

	      The above example will output:

	      9

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