将非字母数字字符转换为 unicode 代码

Question

I receive a token in this format :

{"signature": "MEQCIFf4uQXQYR6fA48cHZMwR5K0bO/wsK5ygoCukmAfWslIAiAdc4kN1BEixxrreSI3W3x4a92+fFTw7/Ulqw9RuJPRzg\u003d\u003d","protocolVersion": "ECv1", "signedMessage": "{\"encryptedMessage\":\"HKdqg8pDCiAwaHmGeI+/7xIDXXCTSfK+/SERLh94NBX6l99w7vNgBenMCiaAGvO+nbHkmnaOnwMcq/DpRhFtCJuYjAGKA83UePYjleSgXp8AjTKUweXxpqNEVvexSeflHBQNcx4stvB7lhsCeW9SMhecebfkcgQyGlawBECXrsIWhfIRGHklC6KE18tlA0GfvsQLhKreWspHCxQjgiBDim6uR57aKzTzlTFGYK+IB1mMJbVFTrEeBnKOAlvdt8Nh4BH3DhrmV3HVl+Ydc9V2G6iGZ6EmPxe3QG5dC9aYGollEXieasTFZm1Bt/LQMdyHmQEd+cmdIQNfGhxzz5pWpLP9g8LuoG+8h69TYaVFY2o0FjP2vSuPqGhMlXhcWgb/gJsiAOLGkS2ZdFbhpQg3kEyS5f/h91Wuoxy08JHpFxsvzWL3skfJ5eQc/BykvHyzzxzK\",\"ephemeralPublicKey\":\"BFnxpfpfIeFLmJ/KM/GcQyhU0MBlEReejnKa71gKFnV+5N2t3WNBnaaNu02gjy7Z5d07XO5+O77Qx3abHnw5rwk\\u003d\",\"tag\":\"kbnLkGZKyDKBWQAh6AyCNL55V4SF8DiZ4PeIudtKBH0\\u003d\"}"}     

I need to json_decode it, do something with it then push it back. If I json_decode it, I will get the \= character decoded to =, which is fine. But how do I encode it back ? I think I played with every possible conversion function in PHP and I'm fresh out of ideas.

Here's a sandbox to play around with : http://sandbox.onlinephpfunctions.com/code/b93defec84a9a6f22f5085fbb7628b5afa816d95

Answer 1

In normal work you do not need to encode = to \= but if you must use somthing like this:

$encoded = str_replace('=','\\\=', $encoded);

Note about your sandbox example: In your example the token variable signedMessage is json in json but after changes return as single json and not json in json like before changes. maybe its fine for your application but check it