Imploding and matching array with another array

Question

Say I've got one array like this

$users_names=array(1=>"Abby",2=>"Betty",3=>"Cathy",4=>"Debby");

And another like this

$users_admin=array(1,3);

What is the best way to implode the $users_admin array matching to $users_names?

For example, I would want to do something like this:

echo implode(", ",magical_array_function($users_admin,$users_names));

//echos: "Abby, Cathy"

What I've been doing is this...

foreach ($users_admin as $id_user) $toEcho.=$users_names[$id_user].", ";
echo substr($toEcho,0,-2);

But I know there must be a more efficient way to do it in one line

I use array_keys() all the time. Just re-read the info on it. Still wouldn't know how to do what I'm trying to do. Want to try to submit an example? — rgbflawed
– rgbflawed, Commented Feb 10, 2014 at 19:43

gen_Eric · Accepted Answer · 2014-02-10 19:45:46Z

3

You're looking for array_intersect_key here.

array_intersect_key($users_names, array_flip($users_admin))

answered Feb 10, 2014 at 19:45

gen_Eric

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2 Comments

rgbflawed Over a year ago

That does it! thanks Rocket! Will submit as answer when I'm able

Amal Over a year ago

@rgbflawed: Will submit as answer when I'm able - This made me think you were going to add an answer saying "Hey! It works, thnx for the solution!". Many people actually do that, so I was just making sure. Sorry!

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