PHP - pass PDO connection to all functions - php

Question

I have a try catch block that connects via PDO to a database. I would like to be able to reference it in all my functions without having to pass it as a parameter. How would I do this? The mentioned code is:
try {
$database = new PDO('mysql:host=127.0.0.1;dbname=coop1','root','');
$database->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}catch(PDOException $e) {
echo $e->getmessage();
die();
}
EDIT:
I created a singleton class (attempt below) that executes the try catch block upon _construct
final class database {
private static $instance = NULL;
private function __construct() {
try {
$database = new PDO('mysql:host=127.0.0.1;dbname=coop1','root','');
$database->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
echo $e->getmessage();
die();
}
}
public static function getInstance() {
static $instance = null;
if (self::$instance === NULL) {
$instance = new database();
}
return $instance;
}
}

Answer 1

Declare it as a static attribute of a singleten class. Than you can access it with
$pdo = Singleton::instance()->getConnection();
Alternatively I can suggest taking a look at MArtin Fowler's relational database mapping pattern. It goes a step further, than centralizing ony the connection itself.
Alternatively Doctirne project has a complete implementation of that: www.doctrine-project.org
final class database {
private static $instance = NULL;
private $pdo; //added private variable for pdo
private function __construct() {
try {
$database = new PDO('mysql:host=127.0.0.1;dbname=coop1','root','');
$database->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
echo $e->getmessage();
die();
}
$this->pdo = $database; //saved the connection into the new variable
}
public static function getInstance() {
static $instance = null;
if (self::$instance === NULL) {
$instance = new database();
}
return $instance;
}
//added a function to get the connection itself
function getConnection(){
return $this->pdo;
}
}
So now you use it:
$pdo = database::getInstance()->getConnection();