email - How to send a link in mail using PHP

I am trying to send a link in the mail using PHP but i am not able to format it properly :

$message=".<a href=."http://abc.com/viewprofile.php?userid=".$user_id.">"Click here to view user profile"</a>";

622

Escape the quotes aroundhref :

$message = "<a href=\"example.com\">Link</a>";

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