How can I know a link has Virus/Trojan or not?

I plan write a website directory in PHP. Websites will be submitted by users. I don't know how can I check submitted links are virus/trojan.. or not. Can you help me? It is dangerous if I just copy and paste on address bar or not?I mean that I don't click on the links, just copy/paste.Thank you.

Try Using "Mcafee Site Advisor" for checking virus in links.

opening a new window and putting in the link is the safest way.

just don't download anything

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