如何在PDO中调用父破坏？

Question

I want destroy the PDO connection, I can do this creating a private variable with this structure: $this->_pdo = new PDO(credentials here) and then in the same class:

function __destruct()
{
    $this->_pdo = NULL;
}

But for some operation like lastInsertedId I need to call the parent construct. So I need to use this structure:

public function __construct($dbhost, $dbname, $dbuser = 'root', $dbpass = '', $dbtype = 'mysql') {
    parent::__construct($dbtype . ':host=' . $dbhost . ';dbname=' . $dbname, $dbuser, $dbpass);
} 

How can I destroy the connection using the parent construct?

Answer 1

There isn't a good way to do this unfortunately. You've got two scenarios here

1. You're instantiating PDO and saving it as a class member. At this point you have a variable pointing to the instance so removing that reference will cause it to be eligible for garbage collection
2. You're instantiating PDO from a child class. Here you can't destroy the instance because the child IS the instance. You'd have to go back to the variable holding the instance and unset() it or something similar

Without the class itself I'm not sure we can be more help than this.