php怎麼解決驗證碼無法顯示的問題

//Captcha.class.php文件名
codelen   = $codelen;
		$this->width     = $width;
		$this->height    = $height;
		$this->fontsize  = $fontsize;
		$this->fontfile  = ".\\Public\\Home\\Fonts\\msyh.ttc";
		$this->code      = $this->createCode();
		$this->img       = $this->createImg();
		$this->createBg();     //给画布添加背景色
		$this->createText();  //写入字符串
		$this->line();       //增加干扰线
		$this->outPut();    //输出图像
	}

	//私有的生成验证码随机字符串
	private function createCode()
	{
		//产生随机的字符串数组
		$arr_str = array_merge(range('a', 'z'),range('A', 'Z'),range(0,9));
		//打乱数组
		shuffle($arr_str);
		shuffle($arr_str);
		//从数组中随机指定个数下标
		$arr_index = array_rand($arr_str,$this->codelen);
		//循环下标数组,构建随机字符串
		$str ="";
		foreach ($arr_index as $i) {
			$str .=$arr_str[$i];
		}
		//将验证码字符串存入sess
		$_SESSION['captcha'] = $str;
		return $str;
	}

	//私有的创建一个空画布
	private function createImg()
	{
		return imagecreatetruecolor($this->width, $this->height);
	}

	//私有的分配画布背景色
	private function createBg()
	{	
		$bgcolor = imagecolorallocate($this->img, mt_rand(0,255), mt_rand(0,200), mt_rand(100,255));
		//绘制带背景的矩形
		imagefilledrectangle($this->img, 0, 0,$this->width,$this->height, $bgcolor);
	}

	//私有的写入验证码字符串
	private function createText()
	{	
		//给文本分配颜色
		$color = imagecolorallocate($this->img, mt_rand(100,255), mt_rand(0,200), mt_rand(100,200));
		//写入字符串
		imagettftext($this->img, $this->fontsize, -12, 10, 20, $color, $this->fontfile, $this->code);
		//imagestring($this->img, $this->fontsize, 8, 8, $this->code, $color);
	}
	//私有的输出图像
	private function line()
	{
		//增加干扰线
		for($n=1;$n<$this->codelen;$n++){
			$linecolor = imagecolorallocate($this->img, mt_rand(0,200), mt_rand(0,200), mt_rand(0,200));
			imageline($this->img,mt_rand(0,80), mt_rand(0,30), mt_rand(0,100), mt_rand(0,30), $linecolor);
		}
	}
	//公共的输出图像
	private function outPut()
	{	
		//声明输出的内容的类型
		header("content-type:image/png");
		//输出图像
		imagepng($this->img);
		//销毁图像资源
		imagedestroy($this->img);
	}

}

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