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If you don't see the test messages in Firefox then install the FirePHP extension and enable it for your site.
If you don't see the test messages in Chrome then install the FirePHP extension and enable it for your site.

The following code is used to generate the demo:

 FB::group('HSFirePHP!::LOG', array('Color' => '#0000FF'));
FB::log('Plain Message');
FB::info('Info Message');
FB::warn('Warn Message');
FB::error('Error Message');
FB::log('Message','Optional Label');
FB::groupEnd();

You will see 5 messages (log, info, warn, error, log with optional label):

The following code is used to generate the demo:

FB::group('HSFirePHP!::ERROR', array('Color' => '#0000FF'));
if (version_compare(phpversion(), '8.0.0.all', '<'))
{
trigger_error('', E_ERROR);
}
else
{
$E_WARNING++;
}
if (version_compare(phpversion(), '8.0.0.all', '<'))
{
$E_NOTICE++;
}
else
{
date_default_timezone_set('INVALID');
}
trigger_error('E_USER_ERROR', E_USER_ERROR);
trigger_error('E_USER_WARNING', E_USER_WARNING);
trigger_error('E_USER_NOTICE');
if (version_compare(phpversion(), '8.0.0.all', '<'))
{
mb_ereg_replace('', '', '', 'e');
}
else
{
$array = [0, 1, 2];
usort($array, function (int $a, int $b): bool {
return $a > $a;
});
}
trigger_error('E_USER_DEPRECATED', E_USER_DEPRECATED);
FB::groupEnd();

You will see 7 errors (E_WARNING, E_NOTICE, E_USER_ERROR, E_USER_WARNING, E_USER_NOTICE, E_DEPRECATED, E_USER_DEPRECATED):

Execution will stop after the exception handler is called. You can test this here. Joomla! 4.x will try to catch exceptions and display an own error page.
Warning: In Joomla! 3.x you will no longer be able to render the page this tag is used in.

The following code is used to generate the demo:

if (4 !== Version::MAJOR_VERSION)
{
FB::group('HSFirePHP!::EXCEPTION', array('Color' => '#0000FF'));
}
throw new Exception('Uncaught Exception');

You will see 1 uncaught exception:

The following code is used to generate the demo:

FB::group('HSFirePHP!::ASSERTION', array('Color' => '#0000FF'));
assert(true == false);
FB::groupEnd();

You will see 1 assertion (true == false) with result FALSE:

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