all.php

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<?php
elgg_register_event_handler('all', 'object', 'example_event_handler');

// This function will be called for any event of type 'object'
function example_event_handler($event, $type, $object) {
    // check what sort of object is passed
    if ($object instanceof ElggObject) {
        $subtype = $object->getSubtype();

        switch ($subtype) {
            case 'blog':
            case 'thewire':
            case 'pages':
                // prevent these object subtypes from being saved or changed
                return false;
            default:
                return true;
        }

    }

    return true;
}