#53299 - Add support for ENUM in is_serialized() detection.

[konradyoast]

Trac ticket: https://core.trac.wordpress.org/ticket/53299

[github-actions]

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[d-claassen]

I've added several tests to confirm existing behaviour of the is_serialize() function. I've based the input for these tests on the existing tests for is_serialized_string.

To test the Enum serialization, I've created and serialized an Enum on 3v4l.org ((link)[https://3v4l.org/J6h8o]). The given input and result there are shown below for PHP 8.1, which confirms the case for the E character that's added in the is_serialize() function.

<?php

enum Foo
{
    case bar;
}

echo serialize( Foo::bar );
// E:7:"Foo:bar";

[costdev]

Thanks for adding the tests @konradyoast! This review makes suggestions for consistency in the test suite and some additional datasets.

To committers:
This commit is a docs change which should be committed separately from the unit tests included in this PR.

[costdev]

Thanks for the changes @konradyoast! LGTM 👍

[mukeshpanchal27]

LGTM

[audrasjb]

committed in https://core.trac.wordpress.org/changeset/53886