gmp_sign

(PHP 4 >= 4.0.4, PHP 5)

gmp_sign — Sign of number

int gmp_sign ( resource $a )

Checks the sign of a number.

a: It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

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

Пример #1 gmp_sign() example


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

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

// zero
echo gmp_sign("0") . "\n";
?>

Результат выполнения данного примера:

1
-1
0