How Can I Access Class Constants Dynamically in PHP?

Access Class Constants Dynamically

In situations where it's necessary to access class constants indirectly, particularly using a variable that holds the constant's name, implementing this functionality can be challenging. Fortunately, there are two practical approaches to achieve this:

Constant Function

The constant function enables access to constants defined both through define and class constants. In the given scenario:

<code class="php">class A
{
    const MY_CONST = 'myval';

    static function test()
    {
        $c = 'MY_CONST';
        return constant('self::'. $c);
    }
}

echo A::test(); // Output: myval</code>

Reflection Class

Alternatively, ReflectionClass provides another means of dynamically accessing class constants:

<code class="php">$ref = new ReflectionClass('A');
$constName = 'MY_CONST';
echo $ref->getConstant($constName); // Output: myval</code>

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