lucy24 - 11:17 pm on Mar 14, 2013 (gmt 0)
A lot of spammmy links where made from elsewhere when my old website was made in static html but these links where pointing to non existing php pages
I have more than a thousand of these 404 in Google Webmaster tools and I would like to redirect all of them on one dedicated page to them on my new site to get rid of this important amount of 404.
No, you wouldn't. If unwanted external links to nonexistent pages are getting 404 responses, the correct thing is already happening.
ONLY redirect links that you want to keep, and then only if the link points to a specific page whose URL has now changed.
For all others, a well designed 404 page is all you need.