PHP PDO: Undefine variable - php

Question

I have created a database class which is throwing an error of
Undefined variable: options in C:path/ on line 21
and I cant seem to figure out why.
class Db
{
private static $instance = null;
private $options = array(
PDO::ATTR_PERSISTENT => true,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
);
private function __construct() {}
private function __clone() {}
public static function getInstance()
{
if (!isset(self::$instance)) {
self::$instance = new PDO('mysql:host=localhost;dbname=mydb', 'root', '', $options);
}
return self::$instance;
}
}

Answer 1

Your $options doesn't exist. You should reference the defined one as $this->options, but that's not a solution for you as you are using it in a static function: the $this context is not available.
You could just define your options in that static method I guess, like below. Not the prettiest solution as now your settings are hidden in your creation-method, but as an example:
class Db
{
private static $instance = null;
private function __construct() {}
private function __clone() {}
public static function getInstance()
{
$options = array(
PDO::ATTR_PERSISTENT => true,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
);
if (!isset(self::$instance)) {
self::$instance = new PDO('mysql:host=localhost;dbname=mydb', 'root', '', $options);
}
return self::$instance;
}
}
The error by the way is quite clear: you are using a variable $options that doesn't exist at that point so you get an error that says it's not defined.