Singleton Pattern Demo
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<?php class Configuration { static private $instance = NULL; private $settingsArray; private function __construct(){ } public function __destruct() { if(!$this->updated) { return; }
foreach ($this->settingsArray as $key => $value) { echo("$key = "$value"n"); }
} public function getInstance() { if(self::$instance == NULL) { self::$instance = new Configuration(); } return self::$instance; } public function get($name) { if(isset($this->settingsArray[$name])) { return $this->settingsArray[$name]; } else { return(NULL); } } public function set($name, $value) { if(!isset($this->settingsArray[$name]) OR ($this->settingsArray[$name] != $value)) { $this->settingsArray[$name] = $value; $this->updated = TRUE; } } }
$config = Configuration::getInstance(); $config->set("username", "A"); $config->set("password", "B"); print($config->get("username")); ?>
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