InvalidEnumCaseValue

Emitted when case value is invalid (see below).

Case with a value on a pure enum

<?php

enum Status 
{
    case Open = "open";
}

Either remove the value or alter the enum to be backed.

<?php

enum Status: string 
{
    case Open = "open";
}

<?php

enum Status: string 
{
    case Open;    
}

Either alter the enum to be pure, or add a value.

<?php

enum Status 
{
    case Open;
}

Case type should match the backing type of the enum.

<?php

enum Status: string
{
    case Open = 1;
}

Change the types so that they match

<?php

enum Status: string 
{
    case Open = "open";
}

Case type should be either int or string.

<?php

enum Status: int {
    case Open = [];
}

Change the case value so that it's one of the allowed types (and matches the backing type)

<?php

enum Status: int
{
    case Open = 1;
}