array of containing each unique value

[kohaleraxa]

How should I write PHP to build an array of containing each unique value in a table column?

Lets say the table headings are "code", "first_name", "last_name"
Data in the table "1" "Bob" "Smith", "2" "Tom" "Jones", "3" "David" "Green".

So I want a MySQL query that returns
$variable = array(1, 2, 3)

How can I do that?
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[johnmacd]

select code,first_name,last_name from table name;

[johnj]

please read about the built-in function called mysql_fetch_array
http://php.net/manual/en/function.mysql-fetch-array.php