PHP：函数返回值的正确布尔条件参数？

Question

I have written a function that returns data on success and false on failure.

I was wondering if this is considered a proper way of evaluating the return value in php.

function data(){
  if($all_is_good){
    return $data
  }else{
    return false;
  }
}

$data = data(); //basically either a long series of strings or arrays

if(!$data){  //<-- this is the line I'm concerned about, is it safe to assume this?
   echo 'oh no, bad stuff happened';
}

Thank you so much!

Answer 1

What you have there is fine, although alternatively, you could use if($data === false) {. This ensures that $data is actually false, considering 0 and NULL are also seen as false.