How to convert positive number to negative in PHP?

@rollin You can multiply by -1 to convert any positive number to negative in PHP, here is code as example:

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<?php

$number = 5;

// Make it positive in case if number is negative
$negative = abs($number) * -1;

// Output: -5
print_r($negative);

@rollin 

In PHP, you can convert a positive number to a negative number by prefixing the number with a minus sign (-). For example, if you have a variable $x that contains the number 5, you can convert it to a negative number by doing:

$x = -5;

You can also use the unary negation operator (e.g. "-") to convert a number to negative:

$x = -$x;

This will change the sign of the number stored in $x to negative.