php闭包实验

class IArray extends ArrayObject  
{      
	static function make($array)      
	{          
		return new self($array);      
	}

	function map($func)      
	{          
		$res = new self();
		
		foreach ($this as $k => $v)   
		{   
			$res[$k] = $func($k, $v);          
		}
		return $res;      
	}
	
	function filter($func)      
	{          
		$res = new self();
		
		foreach ($this as $k => $v)   
		{              
			if ($func($k, $v))   
			{                  
				$res[$k] = $v;             
			}      
		}
		return $res;      
	}
}

$nums = array(10,20,30,40);
$res = IArray::make($nums)->filter(function($k, $v) { return $v > 15; })->map(function($k, $v) { return $v * 2; });
print_r($res);