What are the potential drawbacks of customizing the authentication prompt text in PHP when using htaccess or WWW-Authenticate?

Customizing the authentication prompt text in PHP when using htaccess or WWW-Authenticate can potentially confuse users or make it easier for attackers to craft phishing attempts. To mitigate this risk, it's important to provide clear and consistent authentication prompts that clearly identify the purpose of the prompt and the entity requesting authentication.

header('WWW-Authenticate: Basic realm="Custom Realm Name"');
header('HTTP/1.0 401 Unauthorized');
echo 'Authorization Required';
exit;