basic.php

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<?php
elgg_register_plugin_hook_handler('forward', '404', 'example_plugin_hook_handler');

function example_plugin_hook_handler($hook, $type, $value, $params) {
    var_dump($hook);
    var_dump($type);
    var_dump($value);
    var_dump($params);

    // we are not changing $value so return null
    return null;
}