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Question

How can I access class constants within a function that is defined inside that class?

class Test{

    const STATUS_ENABLED = 'Enabled';
    const STATUS_DISABLED = 'Disabled';

    public function someMethod(){
        //how can I access ALL the constants here let's say in a form of array
    }

}

I don't mean to access each constant but rather access ALL the constants in a form of array. I saw something like:

<?php
class Profile {
    const LABEL_FIRST_NAME = "First Name";
    const LABEL_LAST_NAME = "Last Name";
    const LABEL_COMPANY_NAME = "Company";
}


$refl = new ReflectionClass('Profile');
print_r($refl->getConstants());

But what if I want to access ALL the list of constants inside that class?

Answer 1

To get a list of all the defined constants for a class, you'll need to use Reflection:

The ReflectionClass object has a getConstants() method

Answer 2

If you want to collect all the constants as an array, you could use Reflection :

$reflection = new ReflectionClass("classNameGoesHere");
$reflection->getConstants();

However, this would be very slow and mostly pointless. What would be a much better idea, is to simply declare all of the constants in another array, which you then use:

class Test{

    const STATUS_ENABLED = 'Enabled';
    const STATUS_DISABLED = 'Disabled';

    $states = array(
      self::STATUS_ENABLED,
      self::STATUS_DISABLED,

}

This has the added advantage that it'll keep working if you add more constants. There's no reason to assume all of a class' constants are related in any way, unless you explicitly make it so by defining the relation as an array.