scanner.php

<?php

$files = new RecursiveIteratorIterator(new RecursiveDirectoryIterator(__DIR__));
$invalidFiles = array();
foreach ($files as $file) {
    if ($file->isLink() || $file->isDir()) {
        continue;
    }
    $fileName = $file->getFilename();
    if ($fileName == 'config.xml') {
        if (strpos($file->getPathname(), DIRECTORY_SEPARATOR . '.idea' . DIRECTORY_SEPARATOR) !== false) {
            continue;
        }
        $filePath = str_replace(__DIR__, '.', $file->getPathname());
        $xml = simplexml_load_file($filePath);
        foreach ($xml->xpath('//events') as $areaEvents) {
            foreach ($areaEvents->children() as $event) {
                $eventName = $event->getName();
                if ($eventName != strtolower($eventName)) {
                    $invalidFiles[$filePath][] = $eventName;
                }
            }
        }
    }
}

echo '<pre>';
var_export($invalidFiles);
echo '</pre>';