How to convert json object to string array object in php

In PHP, the json_decode function can parse a JSON string into an object or array in PHP, while the json_encode function can convert a PHP object or array into a JSON string. But sometimes we need to convert JSON objects into string array objects, what should we do?

Suppose our JSON string looks like this:

{
    "name": "Tom",
    "age": 18,
    "hobbies": ["reading", "running", "swimming"]
}

We can use the following PHP code to convert it into a string array object:

$json = '{"name":"Tom","age":18,"hobbies":["reading","running","swimming"]}';
$data = json_decode($json, true);

$keys = array_keys($data);
$values = array_values($data);

$str_arr = [];
for ($i = 0; $i < count($keys); $i++) {
    if (is_array($values[$i])) {
        $str_arr[$keys[$i]] = json_encode($values[$i]);
    } else {
        $str_arr[$keys[$i]] = (string) $values[$i];
    }
}

var_dump($str_arr);

First, we will Pass the JSON string to the json_decode function and set the second parameter to true, which means converting the parsed JSON into an associative array.

Next, we use the array_keys function to get the key name of the associative array, and use the array_values ​​function to get the value of the associative array.

Then, we traverse all key names and values ​​through a for loop and determine whether the value is an array. If the value is an array, we will use the json_encode function to convert it to a JSON string; if it is not an array, we will use a cast to convert it to a string.

Finally, we use the key name as the key and the string as the value to build a new associative array. Using the var_dump function to output the results, you can get the following output:

array(3) {
  ["name"]=>
  string(3) "Tom"
  ["age"]=>
  string(2) "18"
  ["hobbies"]=>
  string(28) "["reading","running","swimming"]"
}

As you can see, we successfully converted the JSON object into a string array object. Among them, the key step is to use the json_encode function to convert the array into a JSON string.

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