How to determine whether the string in a variable is an instantiable class in PHP?

<code>$a='myclass';

class myclass{
    static function aa(){
        print_r(9966);
    }
}
</code>

How to determine whether $a is an instantiable class?

Reply content:

<code>$a='myclass';

class myclass{
    static function aa(){
        print_r(9966);
    }
}
</code>

How to determine whether $a is an instantiable class?

It can be done using reflection, you can refer to: ReflectionClass::isInstantiable

For example:

<code class="php">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";
}</code>

The stupidest method:

<code><?php
$a='myclass';

class myclass{
  static function aa(){
      print_r(9966);
  }
}

if (@new $a)
{
  echo 'yes';
}
else
{
  echo 'sorry';
}</code>

========
Ah hahaha, what a fool: class_exists

class_exists($a)

---

Sorry, class_exists cannot meet the original poster’s needs!
Please see @aisuhua’s answer