gistfile1.php

<?
$rt = false;  /* $rt will be an array if the event fires */
if ($mgrEvents) {
    $rt = $modx->invokeEvent("OnBeforeManagerLogin", $onBeforeLoginParams);
} else {
    $rt = $modx->invokeEvent("OnBeforeWebLogin", $onBeforeLoginParams);
}
/* If the event fired, loop through the event array and fail if there's an error message  */
if (is_array($rt)) {
    foreach ($rt as $key => $value) {   /* php4 compatible */
        if ($value !== true) {
            return $modx->error->failure($value);
        }
    }
    unset($key,$value);
}