Update data models

[openactive-bot]

Update PHP data models to the latest version based on the OpenActive Vocabulary (codified by the Data Models), Test Interface and Beta Namespace.

[nathansalter]

You can't have a class called Class in PHP

[drinkynet]

:)

DateTime::toISO8601() is also not a method, its just DateTime::ISO8601();

Erroneous line:

models-php/tests/Unit/Accessors/SessionSeriesTest.php

Line 35 in 45ceb5e

$sessionSeries->getStartDate()->toISO8601()

Docs ref: https://www.php.net/manual/en/class.datetimeinterface.php#datetimeinterface.constants.iso8601

[nickevansuk]

Strange as the class called Class existed previously: https://github.com/openactive/models-php/blob/f78e51db0d329636a504ecc13409d8af7aab4713/src/Models/SchemaOrg/Class.php

[drinkynet]

Maybe the autoloader never loaded it because it was never used before?

<?php
// Try to make a class called Class

class Class 
{
    public function __construct()
    {
        echo 'hi';
    }
}

$myClass = new Class();

running this script gives: Parse error: syntax error, unexpected token "class", expecting identifier in class-test.php on line 4 expected output is hi.

[nickevansuk]

Make sense! Given the error was already here I wonder if we merge this PR and then solve this issue separately?

[drinkynet]

The 5.6 test is failing for a different reason (this one: #111 (comment)) to the 7.4 test.

But it seams reasonable to move the class thing to a new issue

[nickevansuk]

I've created #112 which should allow this to pass?