CFDI 4.0 Validation Rules and Differences from 3.3

<?php
use CfdiUtils\CfdiValidator40;

$xmlContent = file_get_contents('/path/to/cfdi40.xml');

$validator = new CfdiValidator40();
$asserts = $validator->validateXml($xmlContent);

if ($asserts->hasErrors()) {
    echo 'Validation failed:' . PHP_EOL;
    foreach ($asserts->errors() as $error) {
        echo vsprintf('%-10s %-8s %s => %s', [
            $error->getCode(),
            $error->getStatus(),
            $error->getTitle(),
            $error->getExplanation(),
        ]) . PHP_EOL;
    }
} else {
    echo 'CFDI 4.0 passed all validation rules.' . PHP_EOL;
}

<?php
use CfdiUtils\CfdiCreator40;

/** @var CfdiCreator40 $creator */
$asserts = $creator->validate();

foreach ($asserts as $assert) {
    echo vsprintf('%-10s %-8s %s => %s', [
        $assert->getCode(),
        $assert->getStatus(),
        $assert->getTitle(),
        $assert->getExplanation(),
    ]) . PHP_EOL;
}