How to Get a List of Defined Constants in a PHP Class?

How to Retrieve Defined CONSTs on a PHP Class

Question:

How can one obtain a list of CONSTs defined within a PHP class? Using the get_defined_constants() function proves insufficient.

Answer:

Leveraging the ReflectionClass interface provides a solution to this query. Repeated executions of this process may benefit from caching the resulting data.

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());

Output:

Array
(
    'LABEL_FIRST_NAME' => 'First Name',
    'LABEL_LAST_NAME' => 'Last Name',
    'LABEL_COMPANY_NAME' => 'Company'
)

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