Question

I am trying to write PHP code where I connect to two different databases.

On the first database I run a query and get a column (for e.g. column output: 1,2,3,4,5), now I need to feed 1,2,3,4,5 into a second SQL query which has a statement like:

select key from table where foo = '1','2','3','4','5'

How it can be done in PHP?

Answer 1

It looks like you’re looking for the MySQL IN Clause

That doesn’t really have to anything with PHP, or I don’t really get what you mean. Anyway:

$query1 = $db->query("SELECT values FROM table");
$results = $db->fetchResults();

$query2 = $db2->query("SELECT x FROM foo WHERE y IN (".implode(',', $results).")");
$results = $db2->fetchResults();

Those lines of pseudo code (without validation) should get you started.