How to convert json string to json object or array object in php

In PHP, we can use the built-in function json_decode() to convert a JSON string into a JSON object or array object.

First, we need to make sure we have obtained a JSON string. We can use the following code to get a JSON string from a data source:

// 模拟一个请求，获取 JSON 字符串
$url = 'http://example.com/data.json';
$jsonString = file_get_contents($url);

In this example, we use file_get_contents() to get the contents of a remote JSON file. If your JSON file is already stored locally, you can also use file_get_contents() to read the contents of the file directly.

Next, we need to call the json_decode() function to convert the JSON string into a JSON object or array object. When calling the json_decode() function, we can pass in two parameters: the first parameter is the JSON string to be decoded, and the second parameter is a Boolean value, which determines whether the returned type is a JSON object. Or an array object. If the second parameter is TRUE, an array object is returned, otherwise an object is returned. Here is an example:

// 将 JSON 字符串转换成 JSON 对象
$jsonObject = json_decode($jsonString);

// 将 JSON 字符串转换成数组对象
$jsonArray = json_decode($jsonString, true);

In this example, we first call the json_decode() function to convert the JSON string into a JSON object. After this, we also called the json_decode() function, but passed in the second parameter true, which will return an array object.

Once we get the JSON object or array object, we can use them easily. The following is a complete example:

$url = 'http://example.com/data.json';
$jsonString = file_get_contents($url);

$jsonObject = json_decode($jsonString);
$jsonArray = json_decode($jsonString, true);

// 打印 JSON 对象
echo $jsonObject->property1;
echo $jsonObject->property2;

// 打印数组对象
echo $jsonArray['property1'];
echo $jsonArray['property2'];

In this example, we first obtain a JSON string and then convert it into a JSON object and an array object. Next, we listed how to get the value of the property from these objects, namely $jsonObject->property1 or $jsonArray['property1'].

In short, it is very easy to convert a JSON string into a JSON object or array object using the built-in function json_decode() in PHP. We only need to call this function and pass in a JSON string to get the object or array we need.

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