使用PHP / PDO从MySQL创建单个数组

Question

I am trying to create a single array from a db table that has few rows like:

--------------
id   |   name
--------------
1    | value 1
2    | value 2
3    | value 3
--------------

I want the created array to be as simple as possible like value1,value2,value3

I am using this function

function getAll()
    {
        //select all data
        $sql = "SELECT name FROM " . $this->table_name . "  ORDER BY id";

        $prep_state = $this->db_conn->prepare($sql);
        $prep_state->execute();

        $row = $prep_state->fetch(PDO::FETCH_ASSOC);
        $this->name = $row['name'];
    }

Is there a simple way to do it, perhaps with another PDO Mode like for example is done with PDO::FETCH_UNIQUE, or a should take a different approach?

UPDATE - This way it worked (thanks to @u_mulder)

function getAll()
{
    $sql = "SELECT name FROM " . $this->table_name . "  ORDER BY id";
    $prep_state = $this->db_conn->prepare($sql);
    $prep_state->execute();

    $names = $prep_state->fetchAll(PDO::FETCH_COLUMN, 0); 
    return(implode(",",$names));

}

Answer 1

What you need is PDO::FETCH_COLUMN mode:

$sql = "SELECT name FROM " . $this->table_name . "  ORDER BY id";
$prep_state = $this->db_conn->prepare($sql);
$prep_state->execute();

// 0 indicates first column of result
$names = $prep_state->fetchAll(PDO::FETCH_COLUMN, 0); 
print_r($names);
// then do what you want.