Changing the sign of a number in PHP?

Question

I have a few floats:

-4.50
+6.25
-8.00
-1.75

How can I change all these to negative floats so they become:

-4.50
-6.25
-8.00
-1         


        

Answer 1

using alberT and Dan Tao solution:

negative to positive and viceversa

$num = $num <= 0 ? abs($num) : -$num ;