PHP considers null is equal to zero

Question

In php, ($myvariable==0) When $myvariable is zero, the value of the expression is true; when $myvariable is null, the value of this expression is also true. How can I exclude the second case? I mean I want the expression to be true only when $myvariable is zero. Of course I can write

($myvariable!=null && $myvariable==0 )

but is there other elegant way to do this?

Answer 1

If your zero could be a string, you should also considere checking the "zero string"

($myvariable === 0 || $myvariable === '0')

Answer 2

I hade faced a similar issue in one of my projects, with a minor difference that I was also using the values ZERO as a valid value for my condition. here's how I solved it using simple logic to separate NULL from zero and other values.

    if (gettype($company_id) === 'NULL') {
        $company = Company::where('id', Auth::user()->company_id)->first();
    } else {
        $company = Company::where('id', $company_id)->first();
    }

Answer 3

$myvariable === 0

read more about comparison operators.

Answer 4

There's an is_null function, but this will just replace your $myvariable!=null

Answer 5

Try ($myvariable === 0) which will not perform type coercion.