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It is possible to use the function update_post_meta on older post?

I have + 1000 posts and I need to update posts using update_post_meta but I'm affraid to do it one by one. Is there a simple way to refresh all posts with some function?

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possible duplicate of Automatic Refresh all posts at once – t31os Feb 24 '11 at 0:55

take a look at:

Automatic Refresh all posts at once

its about the same question and the answer will do for you too.

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