php - How to share same connection with multiple instances of the object?


I was advised to rewrite how I handle connection, as it is now, my class creates new connection on every instance of the object. How would I change it to share connection between multiple objects created with this class?

* This is Users class, deals with finding, updating, creating user
class Users

    private $host   = DB_HOST;
    private $user   = DB_USERNAME;
    private $pass   = DB_PASSWORD;
    private $dbname = DB_NAME;

    private $conn;
    private $stmt;
    public  $error;

    function __construct()
        $dsn = 'mysql:host='.$this->host.';dbname='.$this->dbname.';charset=utf8';
        $options = array(
            PDO::ATTR_EMULATE_PREPARES  => false,
            PDO::ATTR_PERSISTENT        => true,
        try {
            $this->conn = new PDO($dsn,$this->user,$this->pass,$options);
        } catch (PDOException $e) {
            $this->error = $e->getMessage();

    private function mysql_execute_query($sql,$params)
        $this->stmt = $this->conn->prepare($sql);
        return $this->stmt;

    public function find_user_by_provider_uid($provider,$provider_uid)
        $sql = 'SELECT * FROM users WHERE provider = :provider AND provider_uid = :provider_uid LIMIT 1';
        $params = array(
            ':provider'     => $provider,
            ':provider_uid' => $provider_uid
        $result = $this->mysql_execute_query($sql,$params);
        return $result->fetch(PDO::FETCH_ASSOC);



If you really need that, define your property asstatic:

private static $conn;

Of course, make sure that accessing to that will be done right (i.e. not via$this, but viaself (or class name) since it will be no longer belong to instance)

That, however, isn't a good practice: if you want manage connections - manage how many times you'll instantiate your class.

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