**`gmp_sign`** is a function in PHP which checks the sign of a GMP number.

# 
#  Syntax

---
```
gmp_sign(GMP|int|string $num): int
```
---

# 
## Parameters

The function takes in one parameter `num`.

---
> `num` can be a numeric string or  GMP object.

##
## Return value

* The function returns 1 if `num` is positive.

* The function returns -1 if `num` is negative.

* The function returns 0 if `num` is 0.

<?php
echo gmp_sign("550") . "\n";
echo gmp_sign("-700") . "\n";
echo gmp_sign("0") . "\n";
?>

What is gmp_sign in PHP?

gmp_sign in PHP checks the sign of a GMP number, returning 1 for positive, -1 for negative, and 0 for zero.

What is gmp_sign in PHP?

Syntax

Parameters

Return value

Code

Output