php错误，当没有类作用域处于活动状态时，无法访问self ::

Question

People report having this issue on a website of mine. But the code goes like:

    $class = get_called_class();
    $instance = new \ReflectionClass($class);

    $class::$List = array_flip($instance->getConstants()); // Error here

I absolutely never get that error myself.

Does somebody know what's happening?

Answer 1

get_called_class() must be called inside the class itself. I guess you are not seeing errors because you have error_reporting(0) or similar on your localhost.

class Test {
    static public function test() {
        echo get_called_class(); //OK
    }
}

not

<?
echo get_called_class(); //Not OK
?>

---

Update . Eureka!

$class = get_called_class();
$instance = new \ReflectionClass($class);
$class::$List = array_flip($instance->getConstants()); // Error here

should be

...
$instance::List = array_flip($instance->getConstants()); 

You are trying to set a static non-existing value on a string. get_called_class() return a string, not an object, and certainly not a static class .

Answer 2

在某些版本的PHP 5.3.x上，getConstants似乎已损坏。