用PHP解析此JSON对象

Question

I am going to be receiving a JSON object via HTTP POST and I am finding it difficult to parse it. This is what the JSON object looks like:

{ login: {username: 123, password: 456} }, questions:[{ name: "insomnia", type: "boolean", problem: true, question: "Did you experience    insomnia?", answer: null},{ name: "go-to-bed", type: "amount", problem: false, question: "When did you go to bed?", answer: null }]}

I want to parse it into 3 different variables $username, $password and $q

From the example, this is what I expect it to be:

echo $username // **output:** 123

echo $password // **output:** 456

echo $q //**output:** questions:[{ name: "insomnia", type: "boolean", problem: true, question: "Did you experience insomnia?", answer: null},{ name: "go-to-bed", type: "amount", problem: false, question: "When did you go to bed?", answer: null }]

Answer 1

First your example is not a valid json. Here the valid one:

[{
"login": {
    "username": 123,
    "password": 456
},
"questions": [{
    "name": "insomnia",
    "type": "boolean",
    "problem": true,
    "question": "Did you experience    insomnia?",
    "answer": null
}, {
    "name": "go-to-bed",
    "type": "amount",
    "problem": false,
    "question": "When did you go to bed?",
    "answer": null
}]
}]

Next you can use json_decode from a string:

$x = '[{
"login": {
    "username": 123,
    "password": 456
},
"questions": [{
    "name": "insomnia",
    "type": "boolean",
    "problem": true,
    "question": "Did you experience    insomnia?",
    "answer": null
}, {
    "name": "go-to-bed",
    "type": "amount",
    "problem": false,
    "question": "When did you go to bed?",
    "answer": null
}]
}]';

$q = json_decode($x);
print_r($q);
echo $q[0]->login->username;

Answer 2

The JSON in the example is invalid, I fixed it and put together a test, I think this is what you're looking for.

<?php
$json = <<<JSON
{
  "login": {
    "username": 123,
    "password": 456
  },
  "questions": [
    {
      "name": "insomnia",
      "type": "boolean",
      "problem": true,
      "question": "Did you experience insomnia?",
      "answer": null
    },
    {
      "name": "go-to-bed",
      "type": "amount",
      "problem": false,
      "question": "When did you go to bed?",
      "answer": null
    }
  ]
}
JSON;

$decoded = json_decode($json);

$username = $decoded->login->username;
$password = $decoded->login->password;

// Re-encode questions to a JSON string
$q = json_encode($decoded->questions);

echo $username."\n";
echo $password."\n";
echo $q."\n";