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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