Check if Variable exists and === true

Question

I want to check if:

• a field in the array isset
• the field === true

Is it possible to check this with one if statement?

Answer 1

You can simply use !empty:

if (!empty($arr['field'])) {
   ...
}

This is precisely equivalent to your conditions by DeMorgan's law. From PHP's documentation, empty is true iff a variable is not set or equivalent to FALSE:

  isset(x) && x
  !(!isset(x) || !x)
  !empty(x)

As you can see, all three of these statements are logically equivalent.