miniMVC/sys/db.php

<?php 
/**
 * Just for giggles extend PHP's PDO class
 */
class db extends PDO {

	private $where;
	private static $instance;
	
	public static function get_instance($dbname="default")
	{
		if ( ! isset(self::$instance))
		{
			echo 'Creating new instance of db class.';
			self::$instance = new db($dbname);
		}

		return self::$instance;
	}
	
	function __construct($dbname="default", $options=array())
	{
		//Include the database config file
		load_file('config/db','app');
		
		// Array manipulation is too verbose
		extract($db_conf[$dbname]);
		
		// Sqlite doesn't use dbname param
		$dsn = (stripos($type, "sqlite") === FALSE) ? "{$type}:dbname={$db}" : "{$type}:{$db}";
		
		// Set hostname if applicable
		if(isset($host))
		{
			$dsn .= ($host !== "") ? ";host={$host}" : "";
		}

		// Set port if applicable
		if(isset($port))
		{
			$dsn .= ($port !== "") ? ";port={$port}" : "";
		}
		
		if($user === "" && $pass === "")
		{
			$user = null;
			$pass = null;
		}

		$opts = array(
			PDO::ATTR_PERSISTENT => (isset($persist)) ? $persist : FALSE,
		);
		
		if( ! isset($persist))
		{
			unset($opts[PDO::ATTR_PERSISTENT]);
		}
		
		$options = array_merge($opts, $options);
		
		parent::__construct($dsn, $user, $pass, $options);
	}
	
	// --------------------------------------------------------------------------
 	
 	/** 
 	 * PHP magic method to facilitate dynamic methods
 	 *
 	 * @param string $name
 	 * @param array $args
 	 */
 	function __call($name, $args)
 	{
 		if(is_callable($this->$name))
 		{
 			//Add $this to the beginning of the args array
 			array_unshift($args, $this);
 			
 			//Call the dynamic function
 			return call_user_func_array($this->$name, $args);
 		}
 	}
	
	// --------------------------------------------------------------------------
	
	/**
	 * Prints out the contents of the object when used as a string
	 * 
	 * @return string
	 */
	function __toString()
	{
		$args = func_get_args();
		$method = ( ! empty($args)) ? $args[0] : "print_r";
		
		$output = '<pre>';
	
		if($method == "var_dump")
		{
			ob_start();
			var_dump($this);
			$output .= ob_get_contents();
			ob_end_clean();
		}
		else if($method == "var_export")
		{
			ob_start();
			var_export($this);
			$output .= ob_get_contents();
			ob_end_clean();
		}	
		else
		{
			$output .= print_r($this, TRUE);
		}
	
		return $output . '</pre>';
	}
	
	// --------------------------------------------------------------------------
	
	/**
	 * Constructor without the "new"
	 *
	 * @param array $members
	 */
	function __invoke($db="default")
	{
		return self::get_instance($db);
	}

    function start_transaction()
    {
    }

    function end_transaction()
    {

    }
}

// End of db.php