How to get class from string class name in Symfony

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?

Are you saying that the class Accomodation doesn't exist? If so in what circumstances are you trying to access an attribute of a class which doesn't exist? If I'm misunderstood, please clarify and add a little background info. — alex-greaves
– alex-greaves, Commented Oct 30, 2016 at 10:09
Sorry about my explanation... I have a string 'AppBundle:Accomodation' and I need the class Accomodation (already exists). — jmunozco
– jmunozco, Commented Oct 30, 2016 at 10:17
If you need to dump in an action method of a controller, then just import the respective class (Accomodation, in your case), by using use AppBundle\Classes\Accomodation (or whatever place you've created the Accomodation class), and it's enough to write it as you already did: dump(Accomodation::MAX_IMAGES). That static property needs to be public accessible. — Dan Costinel
– Dan Costinel, Commented Oct 30, 2016 at 10:23
If there are not hundreds of class names, I guess you need to import them all, then creating the dump as you already did. I really don't know if there is a way to dynamically import entities in a single use statement. Here, this might help you. — Dan Costinel
– Dan Costinel, Commented Oct 30, 2016 at 10:44
@JesusM, you have a class name and a constant name. Then what could be easier than just $class::C, or (new ReflectionClass($class))->getConstant($c)? Do you need it be called "a part of Symfony"? Or do you think Symfony can do it better? — Ruslan Osmanov
– Ruslan Osmanov, Commented Oct 30, 2016 at 11:02

Ruslan Osmanov · Accepted Answer · 2016-10-30 10:32:49Z

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;

edited Oct 30, 2016 at 10:32

answered Oct 30, 2016 at 10:16

Ruslan Osmanov

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2 Comments

jmunozco Over a year ago

What is the way to do a ReflectionClass in Symfony? not in php... thanks for your reply anyway!

Ruslan Osmanov Over a year ago

@JesusM, Symfony is a PHP framework written in PHP. Reflection is a part of PHP core, so you can use it freely in Symfony projects.

Matteo · Accepted Answer · 2016-10-30 11:31:03Z

0

You can use the constant function as follow:

$constant = 'MAX_IMAGES';  
$className = Accomodation::class; // or AppBundle\Classes\Accomodation
$classWithConstant = sprintf('%s::%s', $className, $constant);
dump(constant($classWithConstant));

Hope this help

answered Oct 30, 2016 at 11:31

Matteo

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