php man page for gmp_sign

GMP_SIGN(3)								 1							       GMP_SIGN(3)

gmp_sign - Sign of number

SYNOPSIS
       int gmp_sign (GMP  $a)

DESCRIPTION
	Checks the sign of a number.

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
	Returns 1 if $a is positive, -1 if $a is negative, and 0 if $a is zero.

EXAMPLES
       Example #1

	      gmp_sign(3) example

	      <?php
	      // positive
	      echo gmp_sign("500") . "
";

	      // negative
	      echo gmp_sign("-500") . "
";

	      // zero
	      echo gmp_sign("0") . "
";
	      ?>

	      The above example will output:

	      1
	      -1
	      0

SEE ALSO
       gmp_abs(3), abs(3).

PHP Documentation Group 													       GMP_SIGN(3)