emptyUnsetUndefNull.txt

$unset_var = 10;
unset($unset_var);

$variation_array = array(
  'unset var' => @$unset_var,
  'undefined var' => @$undefined_var,	
  'empty string DQ' => "",
  'empty string SQ' => '',
  'uppercase NULL' => NULL,
  'lowercase null' => null,
  );