How to convert JSON string into PHP object or array

JSON conversion in PHP is a very practical function for converting JSON strings into PHP variables. In PHP, we can use the json_decode() function to convert a JSON string into a PHP object or array.

The json_decode() function is a very useful PHP function that can decode and convert a JSON string into a PHP object or array. When we get data from an external system or API, we usually get the data from JSON format.

JSON is a lightweight data exchange format used to transmit data. The data format is simple and readable. It is a cross-platform and cross-language data exchange format. Due to its excellent data exchange capabilities, it has become a mainstream data format in modern web applications.

Below is a basic JSON string, we will use the json_decode() function to convert it to a PHP variable:

$json_str = '{"name":"John", "age":30, "city":"New York"}';

$person = json_decode($json_str);

In the above code, $json_str is a JSON string, Contains a person's name, age, and city. We use the json_decode() function to parse and convert the JSON string into a PHP object $person.

We can access the properties of the object to get the data:

echo $person->name; // 输出: John

echo $person->age; // 输出: 30

echo $person->city; // 输出: New York

When we need to convert the JSON string to a PHP array, the json_decode() function provides a second parameter to specify the return The value type is as follows:

$json_str = '{"name":"John", "age":30, "city":"New York"}';

$person = json_decode($json_str, true);

echo $person['name']; // 输出: John

echo $person['age']; // 输出: 30

echo $person['city']; // 输出: New York

In the above code, we use the json_decode() function to decode and convert the JSON string into a PHP array $person. We can access array elements to get data.

If the JSON string contains nested objects or arrays, we can use recursive methods to convert them into PHP variables.

Here is an example of a JSON string containing nested arrays and objects:

$json_str = '{"name":"John", "age":30, "city":"New York", "hobbies":["reading", "traveling"],
"contacts":{"email":"john@example.com", "phone":"123-456-7890"}}';

$person = json_decode($json_str);

echo $person->name; // 输出: John

echo $person->hobbies[0]; // 输出: reading

echo $person->contacts->email; // 输出: john@example.com

In the above code, we use the json_decode() function to decode and convert the JSON string to PHP Object $person, this object contains a hobbies array and a contacts object. We can access array elements and object properties to get data.

Summary

JSON conversion is a commonly used function in PHP programming. It decodes a JSON string and converts it into a PHP variable. In PHP, we can use the json_decode() function to convert a JSON string into a PHP object or array, and can access object properties or array elements to get data. If the JSON string contains nested objects or arrays, we can use recursive methods to convert it into PHP variables.

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