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//print_r
//know exactly what values/types you have in your variables


$values = array(0, 0.0, false, '');

var_dump($values);
print_r ($values);

array(4) {
  [0]=>
  int(0)
  [1]=>
  float(0)
  [2]=>
  bool(false)
  [3]=>
  string(0) ""
}

//print or echo

Array
(
    [0] => 0
    [1] => 0
    [2] => 
    [3] => 
)