# How to Always Return a Negative Number in PHP?

## Converting positive numbers to negative and leaving negative numbers unchanged

To make sure that you always return a negative number in PHP, you can do either of the following:

## Using Negation Operator

You can convert a number to its absolute form, and then negate it using the negation operator (`-`):

```-abs(n)
```

This would convert a positive number to negative and ensure that an already negative number remains unchanged. For example, you can use it in the following way:

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

var_dump(neg(1234)); // -1234
var_dump(neg(-1234)); // -1234
```

## Using Arithmetic Operators

You can convert the number to its absolute form, and then negate it either by:

• Multiplying or dividing the number by `-1`, or;
• Subtracting the number from `0`.
```abs(n) * -1
```
```abs(n) / -1
```
```0 - abs(n)
```

This would convert a positive number to negative and ensure that an already negative number remains unchanged. For example, you can use these in the following way:

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

var_dump(neg(1234)); // -1234
var_dump(neg(-1234)); // -1234
```
```function neg(int|float \$num): int|float
{
return abs(\$num) / -1;
}

var_dump(neg(1234)); // -1234
var_dump(neg(-1234)); // -1234
```
```function neg(int|float \$num): int|float
{
return 0 - abs(\$num);
}

var_dump(neg(1234)); // -1234
var_dump(neg(-1234)); // -1234
```

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