PHP严格比较两个对象是假的

$a = new stdClass;
$a->first = 'James';
$a->last = 'Doe';

$b = (object) [
    'first' => 'James',
    'last' => 'Doe',
];

echo 'Loose compare: ' . ($a == $b ? 'equal' : 'different') . PHP_EOL; // equal
echo 'Type compare: ' . (gettype($a) == gettype($b) ? 'equal' : 'different') . PHP_EOL; // equal
echo 'Strict compare: ' . ($a === $b ? 'equal' : 'different') . PHP_EOL; // different
$a = new stdClass;
$a->first = 'James';
$a->las