Detect empty lines in a file

Question

I have a little script that use the function file() for reading the entire file into an array.

$arr = file('file.txt');

The file.txt is structured like this:

john
david

james

So if I debug the array it returns:

array(4) {
  [0]=>
  string(6) "john
"
  [1]=>
  string(7) "david
"
  [2]=>
  string(2) "
"
  [3]=>
  &string(5) "james"
}

I'm trying to find a way to detect the empty line when I analyze every value of the array in a foreach loop:

foreach ($arr as $value) {

I tried with the empty function but nothing.. I also tried with comparing the value with PHP_EOL or , also nothing.

I know that I can avoid empty lines with FILE_IGNORE_NEW_LINES, but I don't need it. I'm just searching for a way to detect this empty lines.