php - What should happen when an if clause has an undefined variable -


i'm working legacy code base, , see this:

public static function blah($formdata = array()) {   $x = null;   $y = null;    if ($formdata['x'] || $formdata['y']) {     $x = $formdata['x'];      if ($formdata['y'])       $y = $formdata['y'];      return $x - $y;   }    //does other stuff x/y , returns result  }

obviously, code unbearably bad, i'm not entirely sure intended effect should be. reason found problem because ran code in environment strict checking on, , if clause caused function die because neither x nor y defined in @ least instances of function being called.

without strict checking on, if block skipped should 1 of variables in clause not defined?

according http://php.net/manual/en/types.comparisons.php, undefined treated false purposes of if tests (though recommend against using this).


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