How does PHP determine if a string in a variable is a class that can be instantiated?

$a='myclass';class myclass{    static function aa(){        print_r(9966);    }}

How to judge $a a class that can be instantiated?

Reply content:

$a='myclass';class myclass{    static function aa(){        print_r(9966);    }}

How to judge $a a class that can be instantiated?

With reflection can be done, you can refer to: reflectionclass::isinstantiable

As an example:

class myclass{    static function aa(){        print_r(9966);    }}$a='myclass';$reflectionClass = new ReflectionClass($a);if($reflectionClass->isInstantiable()) {    echo "类 $a 是可以实例化的";} else {    echo "类 $a 不可以实例化";}

The stupidest way:

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啊哈哈哈，傻逼了：class_exists

class_exists($a)

抱歉，class_exists并不能做到楼主的需求！
请看 @aisuhua 的答案

