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exam/classes/Database/Database.php

@@ -6,25 +6,43 @@ use PDO;
 use Khofmann\Config\Config;
 use Exception;
 
+/**
+ * Facade for database access
+ */
 class Database extends PDO
 {
+  // Instances array to ensure singleton pattern
   private static array $instances = [];
 
+  /**
+   * Private since singleton pattern.
+   */
   private function __construct(string $dsn, string $username = null, string $password = null, array $options = null)
   {
     parent::__construct($dsn, $username, $password, $options);
   }
 
+  /**
+   * Disallow clone
+   */
   private function __clone()
   {
     throw new Exception("Cannot clone a singleton.");
   }
 
+  /**
+   * Disallow wakeup
+   */
   private function __wakeup()
   {
     throw new Exception("Cannot unserialize a singleton.");
   }
 
+  /**
+   * Get the instance. Ensures singleton pattern.
+   *
+   * Loads configuration from `Config` facade
+   */
   public static function getInstance(): Database
   {
     $cls = static::class;