PHP 只有一个类型运算符：instanceof
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- 2016-06-08 17:31:531076browse
<script>ec(2);</script>
PHP 只有一个类型运算符：instanceof 用来测定一个给定的对象，它的父对象或它们所实现的接口是否来自指定的对象类。
instanceof 运算符是 PHP 5 引进的。在此之前用 is_a()，但是 is_a() 已经过时了，最好用 instanceof。
class A { }
class B { }
$thing = new A;
if ($thing instanceof A) {
echo ''A'';
}
if ($thing instanceof B) {
echo ''B'';
}
?>
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