gmp_sign
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_sign — Sign of number
Description
gmp_sign ( GMP|int|string $num ) : int
Checks the sign of a number.
Parameters
-
num -
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 an int.
Return Values
Returns 1 if num is positive, -1 if num is negative, and 0 if num 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
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https://www.php.net/manual/en/function.gmp-sign.php