refactor: 修改验证码接口及登录接口

app/common.php

@@ -32,4 +32,40 @@ if (!function_exists('password_with_salt')) {
     {
         return md5(hash('sha256', $password . $salt));
     }
+}
+
+// 生成随机字符串
+if (!function_exists('random_str')) {
+    /**
+     * 生成随机字符串
+     * @param $length integer 生成的长度
+     * @param $type string 要生成的字符串类型(number, string, all)
+     * @param $convert integer 大小写转换0为小写1为大写
+     * @return string
+     */
+    function random_str($length, $type = "string", $convert = "0")
+    {
+        $conf = [
+            'number' => '0123456789',
+            'string' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
+            'all' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789='
+        ];
+        $string = $conf[$type];
+        if (!$string) {
+            $string = $conf['string'];
+        }
+        $strlen = strlen($string) - 1;
+        $char = '';
+        for ($i = 0; $i < $length; $i++) {
+            $char .= $string[mt_rand(0, $strlen)];
+        }
+        if ($convert > 0) {
+            $res = strtoupper($char);
+        } elseif ($convert == 0) {
+            $res = $char;
+        } elseif ($convert < 0) {
+            $res = strtolower($char);
+        }
+        return $res;
+    }
 }