# How to Negate a Number in PHP?

In PHP, you can negate a number (i.e. convert a positive number to negative, and a negative to positive) in the following ways:

Please note that in PHP, when negating `0`, the result is always `0`.

## Using Negation Operator

You may negate a number using the negation operator (`-`) like so:

```-n
```

This would convert a positive number to a negative number, and a negative number to a positive number. For example, you can use it in the following way:

```function negate(int|float \$num): int|float
{
return -\$num;
}

var_dump(negate(1234)); // -1234
var_dump(negate(-1234)); // 1234

var_dump(negate(0)); // 0
var_dump(negate(-0)); // 0
```

## Using Arithmetic Operators

You may convert a positive number to negative or vice versa by simply multiplying it by `-1`:

```n * -1
```

Similarly, you may also divide the number by `-1` to negate it:

```n / -1
```

You could use either of these, for example, like so:

```function negate(int|float \$num): int|float
{
return \$num * -1;
}

var_dump(negate(1234)); // -1234
var_dump(negate(-1234)); // 1234

var_dump(negate(0)); // 0
var_dump(negate(-0)); // 0
```
```function negate(int|float \$num): int|float
{
return \$num / -1;
}

var_dump(negate(1234)); // -1234
var_dump(negate(-1234)); // 1234

var_dump(negate(0)); // 0
var_dump(negate(-0)); // 0
```

As an alternative to dividing and multiplying by `-1`, you may subtract the number from `0` instead:

```0 - n
```

For example, you could use it in the following way:

```function negate(int|float \$num): int|float
{
return 0 - \$num;
}

var_dump(negate(1234)); // -1234
var_dump(negate(-1234)); // 1234

var_dump(negate(0)); // 0
var_dump(negate(-0)); // 0
```

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