gmp_sign

(PHP 4 >= 4.0.4, PHP 5)

gmp_sign — Sign of number

Description

int gmp_sign ( GMP $a )

Checks the sign of a number.

Parameters

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() example

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

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

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

The above example will output:

1
-1
0

See Also

• gmp_abs() - Absolute value
• abs() - Absolute value