PHP odbc_prepare WHERE field IN ($LIST) - (Progress OpenEdge 10.2A)

I am trying to write a query using the odbc_prepare and odbc_execute statements like so:

$query = 'SELECT * FROM TABLE WHERE names IN (?) AND age < ?';
$names = "Joe, John, Billy";
$age = 21;
$result = odbc_prepare($this->connection, $query);
odbc_execute($query, array($names, $age));


Of course for some reason this isn't working and I have tried several variations on my $names variable formatting. Any help would be appreciated as I haven't been able to find any examples of a query that uses odbc_prepare and a WHERE IN clause.

I am connecting to a Progress database using an OpenEdge 10.2A odbc driver.

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