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Selecting / Doing something for one row-value per row?


Adastra

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I've written a new small function to send someone an email when a follow-up comment is made on a bloglike thing, but I would like to send them only ONE e-mail per entry, or per e-mail address, in case they signed up for a follow-up more than once.

How exactly can I do that? I can't think of any function in PHP (I'm still a noob), and I also don't know how to approach this in SQL.
I thought something like "SELECT * FROM blog_comments WHERE entry=$entry AND followup='yes' and COUNT(email) >= 1" might work, but I get an error with that statement.
Anyone got any better ideas? :)
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[quote author=GingerRobot link=topic=100024.msg394309#msg394309 date=1152525187]
Another way would be to store all the emails in an array,  then use the array_unique() function to remove duplicate entries.

You could then send an email to each of those.
[/quote]
How exactly does that work? Do you have a code sample? Sry, I'm such a noob... ^^
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