gmp_sign

Sign of number (PHP 4 >= 4.0.4, PHP 5)
int gmp_sign ( resource a )

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

例 694. gmp_sign() example

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

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

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

The printout of the above program will be:

1
-1
0