Question

Im currently testing a simple PHP function.

I want to to return the currently value of a field if the function is called without any parameter passed or set a new value if a parameter is passed.
Strange thing is: if I pass 0 (var_dump is showing correct value int(1) 0), the function goes into the if branch like i called the function without any value and i just don’t get why.

function:

public function u_strasse($u_strasse = 'asdjfklhqwef'){
  if($u_strasse == 'asdjfklhqwef'){
    return $this->u_strasse;
  } else {
    // set new value here
  }
}

either u_strasse() or u_strasse(0) gets me in the if branch.

Answer 1

When comparing variables of different types (specifically strings and numbers), both values will be converted to a number. Therefore, your ‘asdjfklhqwef’ converts to 0 (number), the comparison is true.

http://www.php.net/manual/en/language.operators.comparison.php