废除NOW_TIME常量

修复验证码不显示问题

src/Captcha.php

@@ -98,7 +98,7 @@ class Captcha
             return false;
         }
         // session 过期
-        if (NOW_TIME - $secode['verify_time'] > $this->expire) {
+        if (time() - $secode['verify_time'] > $this->expire) {
             Session::delete($key);
             return false;
         }
@@ -182,7 +182,7 @@ class Captcha
         $code = $this->authcode(strtoupper(implode('', $code)));
         $secode = [];
         $secode['verify_code'] = $code; // 把校验码保存到session
-        $secode['verify_time'] = NOW_TIME; // 验证码创建时间
+        $secode['verify_time'] = time(); // 验证码创建时间
         Session::set($key . $id, $secode);
 
         header('Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate');

src/CaptchaController.php

@@ -12,9 +12,8 @@
 namespace think\captcha;
 
 use think\Config;
-use think\Controller;
 
-class CaptchaController extends Controller
+class CaptchaController
 {
     public function index($id = "")
     {

src/helper.php

@@ -35,7 +35,7 @@ function captcha($id = "", $config = [])
  */
 function captcha_src($id = "")
 {
-    return \think\Url::build('/captcha' . $id ? "/{$id}" : '');
+    return \think\Url::build('/captcha' . ($id ? "/{$id}" : ''));
 }