PHP mySQL查询将单个字段作为2元素数组返回

Question

I'm using a mySQL statement in a PHP script to return the email address for a given user. You'll see the function below:

    public static function getEmailAddress($username) {
    $conn = parent::connect();
    $sql = "SELECT emailAddress FROM " . TBL_USERS . " WHERE username = '". $username ."';";

    try {
        $st = $conn->prepare($sql);
        $st->bindValue("username", $username, PDO::PARAM_STR);
        $st->execute();
        $emailAddress = $st->fetch();
        return $emailAddress;
        parent::disconnect($conn);
    } catch(PDOException $e) {
        die("emailAddress lookup query failed: " . $e->getMessage());
    }
}

This returned an array with two elements, both being the correct email address. I changed the return statement to

    return implode(array_unique($emailAddress)); 

which solved the problem, but there has to be a better way to do this. This seems like pretty elementary stuff, and I'd like to do it right. What's wrong?

Answer 1

The problem is that the default response type of fetch is

PDO::FETCH_BOTH (default): returns an array indexed by both column name and 0-indexed column number as returned in your result set

I also find this quite confusing.

Specify the parameter fetch_style to either PDO::FETCH_ASSOC or PDO::FETCH_OBJ to get what you would expect.

http://php.net/manual/en/pdostatement.fetch.php

Hope this helps