1. Common.php新增getNonce函数

Author: shinn-lancelot

src/Common.php

@@ -31,5 +31,33 @@ public static function httpRequest($url, $data = null)
         curl_close($curl);
         return $output;
     }
+
+    /**
+     * 获取字符串
+     * @param int $type
+     * @param int $length
+     * @return string
+     */
+    public static function getNonce($type = 1, $length = 16)
+    {
+        $nonce = '';
+        switch ($type) {
+            case 1:
+                $string = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+                break;
+            case 2:
+                $string = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+                break;
+            case 3:
+                $string = '0123456789';
+                break;
+            default:
+                $string = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+        }
+        for ($i = 0; $i < $length; $i++) {
+            $nonce .= substr($string, mt_rand(0, strlen($string) - 1), 1);
+        }
+        return $nonce;
+    }
 }