--TEST--
SimpleXMLElement->addAttribute()
--EXTENSIONS--
simplexml
--FILE--
<?php
    $simple = simplexml_load_file(__DIR__."/book.xml");
    $simple->addAttribute('type','novels');

    var_dump($simple->attributes());
    echo "Done";
?>
--EXPECT--
object(SimpleXMLElement)#2 (1) {
  ["@attributes"]=>
  array(1) {
    ["type"]=>
    string(6) "novels"
  }
}
Done