feat : mypage

app/Extend/StringUtil.php

@@ -96,4 +96,25 @@ class StringUtil
             mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
         );
     }
+
+    /**
+     * @param $str
+     * @param int $num
+     * @return string
+     */
+    public static function maskMiddleStrByNum($str,int $num) {
+        $len = strlen($str);
+
+        if ($len <= $num) {
+            return str_repeat('*', $num);
+        }
+
+        $left_len = floor(($len - $num) / 2);
+        $right_len = ($len - $num) - $left_len;
+
+        $left = substr($str, 0, $left_len);
+        $right = substr($str, -$right_len);
+
+        return $left . '****' . $right;
+    }
 }