Gets constants

# ReflectionClass::getConstants

(PHP 5, PHP 7, PHP 8)

ReflectionClass::getConstants — Gets constants

### Description

public ReflectionClass::getConstants(?int `$filter` = `null`): array

Gets all defined constants from a class, regardless of their visibility.

### Parameters

`filter`

  The optional filter, for filtering desired constant visibilities. It's configured using the ReflectionClassConstant constants, and defaults to all constant visibilities.

### Return Values

An array of constants, where the keys hold the name and the values the value of the constants.

### Changelog

Version | Description
--- | ---
8.0.0 | `filter` has been added.

### See Also

- ReflectionClass::getConstant() - Gets defined constant

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