How to convert string to JSON object array in php

PHP is a popular server-side programming language with a wide range of applications, especially in web development. PHP provides a rich function library and built-in data types to help developers easily manipulate different types of data. In this article, we will explore how to convert a string into an array of JSON objects.

JSON (JavaScript Object Notation) is a lightweight data format that is widely used in web applications. It uses key-value pairs to represent data, which is easy to read and use. PHP provides some functions to create and parse data in JSON format. We can use the json_encode() function to convert a PHP array into a JSON-formatted string, and the json_decode() function to decode a JSON-formatted string into a PHP array.

Let's take a look at how to convert a string into a JSON object array object. Suppose we have a string named $person, which represents personal information as follows:

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

The string conforms to JSON format and has three attributes: name, age and city. To convert it to a JSON object, we need to use the json_decode() function as follows:

$json_person = json_decode($person);

This will convert the $person string into an object with three properties: name, age and city . Now, we can access them via:

echo $json_person->name; // 输出 John echo $json_person->age; // 输出 30 echo $json_person->city; // 输出 New York

If we want to access the JSON object as an array, we can set the second parameter to true as follows:

$json_person = json_decode($person, true); echo $json_person['name']; // 输出 John echo $json_person['age']; // 输出 30 echo $json_person['city']; // 输出 New York

This will Convert the $person string into an array. The array has three key-value pairs, corresponding to the name, age and city attributes.

Now, suppose we have a string named $people, which contains multiple personal information, as shown below:

$people = '[{"name": "John", "age": 30, "city": "New York"}, {"name": "Jane", "age": 25, "city": "Los Angeles"}]';

This string conforms to JSON format, indicating that a string containing two An array of individuals. To convert it to a JSON object array object, we need to use the json_decode() function as follows:

$json_people = json_decode($people);

This will convert the $people string into an array containing two objects, each Objects have three attributes: name, age and city. Now, we can access them in the following way:

echo $json_people[0]->name; // 输出 John echo $json_people[0]->age; // 输出 30 echo $json_people[0]->city; // 输出 New York echo $json_people[1]->name; // 输出 Jane echo $json_people[1]->age; // 输出 25 echo $json_people[1]->city; // 输出 Los Angeles

If we want to access the JSON object array as an array, we can set the second parameter to true as follows:

$json_people = json_decode($people, true); echo $json_people[0]['name']; // 输出 John echo $json_people[0]['age']; // 输出 30 echo $json_people[0]['city']; // 输出 New York echo $json_people[1]['name']; // 输出 Jane echo $json_people[1]['age']; // 输出 25 echo $json_people[1]['city']; // 输出 Los Angeles

This The $people string will be converted into an array, which contains two associative arrays, each array has three key-value pairs, corresponding to the name, age and city attributes respectively.

In this article, we have explored how to convert a string into an array of JSON objects. PHP provides powerful function libraries and built-in data types that allow us to easily manipulate different types of data. If you are developing web applications, these functions are one of the tools you must master.

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