Which one is correct?
User-agent: * Disallow: index.php
User-agent: * Disallow: /index.php
inorder to block all pages like
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You can use the following robots.txt file if you wish to block all robots from accessing your pages.
# robots.txt for www.domain.com to block all bots User-agent: * Disallow: /
If you wish to block all all URLs that include a question mark (?) you can use the following format
# robots.txt for www.domain.com to block URL with ? mark User-agent: * Disallow: /*?
For more detailed information on how to write robots.txt visit the following link How to Create Robots.txt Files