Extending Error handler using plugin method is not working

Question

I need to save errors in my database. So I am trying to extend Error Handler in my custom module using plugin method. But it is not working. Here is my code

di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Framework\App\ErrorHandler">
        <plugin name="BridgeErrorNotificationErrorHandler" type="Bridge\ErrorNotification\Plugin\ErrorHandlerPlugin" sortOrder="10"/>
    </type>
</config>

ErrorHandlerPlugin.php

<?php
namespace Bridge\ErrorNotification\Plugin;

class ErrorHandlerPlugin
{
    protected $errorPhrases = [
        E_ERROR => 'Error',
        E_WARNING => 'Warning',
        E_PARSE => 'Parse Error',
        E_NOTICE => 'Notice',
        E_CORE_ERROR => 'Core Error',
        E_CORE_WARNING => 'Core Warning',
        E_COMPILE_ERROR => 'Compile Error',
        E_COMPILE_WARNING => 'Compile Warning',
        E_USER_ERROR => 'User Error',
        E_USER_WARNING => 'User Warning',
        E_USER_NOTICE => 'User Notice',
        E_STRICT => 'Strict Notice',
        E_RECOVERABLE_ERROR => 'Recoverable Error',
        E_DEPRECATED => 'Deprecated Functionality',
        E_USER_DEPRECATED => 'User Deprecated Functionality',
    ]; 

    public function afterhandler($errorNo, $errorStr, $errorFile, $errorLine)
    { 
        if (strpos($errorStr, 'DateTimeZone::__construct') !== false) {
        // there's no way to distinguish between caught system exceptions and warnings
          return false;
        }

       $errorNo = $errorNo & error_reporting();
       if ($errorNo == 0) {
         return false;
       }

       $msg = isset($this->errorPhrases[$errorNo]) ? $this->errorPhrases[$errorNo] : "Unknown error ({$errorNo})";
       $msg .= ": {$errorStr} inn {$errorFile} on line {$errorLine}";
       $msg .= "  just for testing";
       throw new \Exception($msg);
    }
}

To test this I am just adding $msg .= " just for testing"; in message.