如何从Symfony中的字符串类名获取类

Question

I need to access a const like this:

dump (Accomodation::MAX_IMAGES);

but I only have the string class name but not the class itself. For example, I have this string 'AppBundle:Accomodation' but I don't have the class Accomodation to access its static properties.

Any idea for Symfony?

Answer 1

If the constant name is static, then access it directly:

echo $class_name::CONSTANT_NAME;

If, however, the constant name is a variable, use Reflection:

$rc = new ReflectionClass($class_name);
echo $rc->getConstant($const_name);

Example

namespace MyNs;

class A {
  const C = 1;
}

$class_name = '\MyNs\A';
$c = 'C';

// method #1
echo $class_name::C, PHP_EOL;

// method #2
$rc = new \ReflectionClass($class_name);
echo $rc->getConstant('C'), PHP_EOL;