gmp_sign

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

gmp_sign — Sign of number

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gmp_sign ( GMP $a ) : int

Checks the sign of a number.

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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 an integer.

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

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Example #1 gmp_sign() example

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

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

// zero
echo gmp_sign("0") . "\n";
?>

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1
-1
0

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