处理PHP类时出错

I am trying to write an error handler class for php. I've tested that the object has been created but it doesn't seem to be handling errors.

I used the same code in a function in the index file initially and it worked fine, but I'd rather have a class. Why is this not handling errors?

class class_error
{
    public function __construct()
    {
        // set to the user defined error handler
        set_error_handler($this->errorHandler());
    }

    public function errorHandler($errno, $errstr, $errfile, $errline)
    {
        //don't display error if no error number
        if (!(error_reporting() & $errno)) {
            return;
        }

        //display errors according to the error number
        switch ($errno)
        {
            case E_USER_ERROR:
                echo "<b>ERROR</b> [$errno] $errstr<br />
";
                echo "  Fatal error on line $errline in file $errfile";
                echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ")<br />
";
                echo "Aborting...<br />
";
                exit(1);
                break;

            case E_USER_WARNING:
                echo "<b>WARNING</b> [$errno] $errstr<br />
";
                break;

            case E_USER_NOTICE:
                echo "<b>NOTICE</b> [$errno] $errstr<br />
";
                break;

            default:
                echo "<b>UNKNOWN ERROR</b> [$errno] $errstr<br />
";
                break;
        }

        //don't execute PHP internal error handler
        return true;
    }
}

Use this:

set_error_handler(array($this, "errorHandler"));

More info: http://php.net/manual/en/language.types.callable.php