[SOLVED] Events > replace an existing twig template with my own

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'trigger'		=> 'catalog/view/product/product/before',
'action'		=> 'extension/myextension/module/myfirstextension.something',

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public function something(string &$route, array &$data): void {

	$data['template'] = 'extension/openwebdev/catalog/view/product/product';
	$this->response->setOutput($this->load->view($data['template'], $data));
	
}

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<div>{{ something }}</div>

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<?php

	......

	// event handler for catalog/view/product/product/before
	public function eventViewProductProductBefore( &$route, &$data, &$code=null ) {

		$template_code = $this->getTemplateCode( $route, $code );

		// modify the template code
		// .....

		$code = $template_buffer;
		return null;
	}


	protected function getTemplateCode( $route, &$code ) {
		if (!empty($code)) {
			return $code;
		}

		$file = DIR_OPENCART . $route . '.twig';
		if (is_file($file) {
			$code = file_get_contents( $file );
		} else {
			trigger_error("Cannot find template file for route '$route'");
			exit;
		}

		return $code;
	}

	......
?>

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public function myfunction(&$route, &$data, &$code = null)
{
$template_code = $this->getTemplateCode($route, $code);
$template_buffer = str_replace('<h1>{{ heading_title }}</h1>', '<h1>{{ heading_title }} - TEST</h1>', $code);
$code = $template_buffer;
return null;
}

protected function getTemplateCode($route, &$code)
{
    if (!empty($code)) {
        return $code;
    }

    $file = DIR_OPENCART . 'catalog/view/template/' . $route . '.twig';
    if (is_file($file)) {
        $code = file_get_contents($file);
    } else {
        trigger_error("Cannot find template file for route '$route'");
        exit;
    }

    return $code;
}