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Grab all key/values from custom fields

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Hey all,

I’m trying to come up with a solution that enables me to show values from custom fields across three different post types. Here’s a bland example:

I use custom fields in three custom post types. The keys are email. The values are an actual email address. What I would like to do is grab all the values from every single post and spit them out in a list.

So:

post_type 1
user1@emailaddress.com
user2@emailaddress.com
user3@emailaddress.com
user4@emailaddress.com
user5@emailaddress.com

post_type 2
user6@emailaddress.com
user7@emailaddress.com
user8@emailaddress.com
user9@emailaddress.com
user10@emailaddress.com

post_type 3
user11@emailaddress.com
user12@emailaddress.com
user13@emailaddress.com
user14@emailaddress.com
user15@emailaddress.com

In a perfect world, I would like to be able to combine all these email addresses in to one single link where I could mass-email every address.

Dang, this seems pretty complicated. Any help would be super appreciated though. No plugins allowed!


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