engine/lib/pagehandler.php

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<?php
function page_handler($handler, $page) {
    global $CONFIG;

    elgg_set_context($handler);

    $page = explode('/', $page);
    // remove empty array element when page url ends in a / (see #1480)
    if ($page[count($page) - 1] === '') {
        array_pop($page);
    }

    // return false to stop processing the request (because you handled it)
    // return a new $request array if you want to route the request differently
    $request = array(
        'handler' => $handler,
        'segments' => $page,
    );
    $request = elgg_trigger_plugin_hook('route', $handler, null, $request);
    if ($request === false) {
        return true;
    }

    $handler = $request['handler'];
    $page = $request['segments'];

    $result = false;
    if (isset($CONFIG->pagehandler)
            && !empty($handler)
            && isset($CONFIG->pagehandler[$handler])
            && is_callable($CONFIG->pagehandler[$handler])) {
        $function = $CONFIG->pagehandler[$handler];
        $result = call_user_func($function, $page, $handler);
    }

    return $result || headers_sent();
}

function elgg_register_page_handler($handler, $function) {
    global $CONFIG;

    if (!isset($CONFIG->pagehandler)) {
        $CONFIG->pagehandler = array();
    }
    if (is_callable($function, true)) {
        $CONFIG->pagehandler[$handler] = $function;
        return true;
    }

    return false;
}

function elgg_unregister_page_handler($handler) {
    global $CONFIG;

    if (!isset($CONFIG->pagehandler)) {
        return;
    }

    unset($CONFIG->pagehandler[$handler]);
}

function elgg_error_page_handler($hook, $type, $result, $params) {
    if (elgg_view_exists("errors/$type")) {
        $content = elgg_view("errors/$type", $params);
    } else {
        $content = elgg_view("errors/default", $params);
    }
    $body = elgg_view_layout('error', array('content' => $content));
    echo elgg_view_page('', $body, 'error');
    exit;
}

function page_handler_init() {
    elgg_register_plugin_hook_handler('forward', '404', 'elgg_error_page_handler');
}

elgg_register_event_handler('init', 'system', 'page_handler_init');

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