imagettftext($this->_image, $this->fontSize, mt_rand(-40, 40), $codeNX, $this->fontSize*1.6, $this->_color, $this->fontttf, $code[$i]);}}// 保存验证码$key = $this->authcode($this->seKey);$code = $this->authcode(strtoupper(implode('', $code)));$secode = array();$secode['verify_code'] = $code; // 把校验码保存到session$secode['verify_time'] = NOW_TIME; // 验证码创建时间session($key.$id, $secode);// ob_clean();header('Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate');header('Cache-Control: post-check=0, pre-check=0', false);header('Pragma: no-cache');header("content-type: image/png");// 输出图像imagepng($this->_image);