<?php

class ErrHandl {
    public function __construct() {
        $this->registerHandler();
    }

    public function registerHandler() {
        set_error_handler([$this, 'errorHandler']);
    }

    public function errorHandler() {
        $this->registerHandler();
        echo 'oh no, an error!';
    }
}

//------

$errHandl = new ErrHandl();

trigger_error('test');
echo 'still alive!';
trigger_error('test2');

echo 'works, thanks to re-registering...';