How to convert JSON string into PHP object?

JSON (JavaScript Object Notation) is a lightweight data exchange format commonly used for front-end and back-end data transmission. In PHP, we can convert JSON strings into PHP objects in order to process and operate the data. Next, let's look at specific code examples.

First, suppose we have a JSON string as shown below:

{
    "name": "John Doe",
    "age": 30,
    "city": "New York"
}

Next, we will use PHP’s built-in function json_decode() to convert this JSON string Convert to PHP object. The code is as follows:

$jsonString = '{"name": "John Doe", "age": 30, "city": "New York"}';
$phpObject = json_decode($jsonString);

// 检查转化后的PHP对象
var_dump($phpObject);

In the above code, the json_decode() function is used to convert the JSON string $jsonString into a PHP object $phpObject. We can use the var_dump() function to view the converted PHP object. After executing the above code, we will get the following output:

object(stdClass)#1 (3) {
  ["name"] => string(8) "John Doe"
  ["age"] => int(30)
  ["city"] => string(8) "New York"
}

As can be seen from the output, the JSON string has been successfully converted into a PHP object, and we can access and manipulate data through the properties of the object. For example, we can use the following code to get the attribute value in the object:

echo $phpObject->name;  // 输出：John Doe
echo $phpObject->age;   // 输出：30
echo $phpObject->city;  // 输出：New York

It should be noted that the json_decode() function also has an optional parameter $assoc , the default is false. When this parameter is set to true, the JSON string will be converted into an associative array instead of an object. An example is as follows:

$jsonString = '{"name": "John Doe", "age": 30, "city": "New York"}';
$phpArray = json_decode($jsonString, true);

// 检查转化后的PHP关联数组
var_dump($phpArray);

Through the above code example, we can clearly understand how to convert a JSON string into a PHP object, and how to access and manipulate the data through attributes or indexes. Conversion between JSON and PHP is a common operation in development, which can better realize data transmission and processing.

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