Create json-encoded array from a PDO query result column

Question

I am creating a json array with data from mysql:

$array = $db->query("SELECT ...")->fetchAll(PDO::FETCH_ASSOC);
print json_encode($array);

This returns:

[{"animal":"alpaca"},{"animal":"buffalo"},{"animal":"cat"},{"animal":"tiger"}] 

But I need it to return data with the following syntax:

 ["alpaca","buffalo","cat","tiger"]

Answer 1

As you can simply use array_values over here but for an alteration you can also use array_column like as

$array = $db->query("SELECT .............")->fetchAll(PDO::FETCH_ASSOC);
print json_encode(array_column($array,'animal'));

Note: array_column() requires PHP > 5.5.0