How to convert object into string array in php

During the development process, it often involves converting objects into strings for easy transmission, storage and other operations. Strings in json format are very convenient in this regard. It can convert objects into string arrays, and there are corresponding parsing tools in various languages. This article will introduce how PHP uses the json_encode function to convert objects into string arrays.

First of all, you need to understand what json is. json (JavaScript Object Notation) is a lightweight data exchange format. It is based on the syntax of ECMAScript (applicable to various languages) and is a standard format for transmitting and storing data. json has the advantages of strong readability, easy operation, cross-platform support, etc., and is widely used in various fields, such as mobile terminals, web applications, big data, etc.

Next, let’s take a look at how to use php to convert an object into a string array in json format. Suppose we have a Person class with two attributes: name and age:

class Person {
    public $name;
    public $age;
    function __construct($name, $age) {
        $this->name = $name;
        $this->age = $age;
    }
}

Now, we create a Person object:

$person = new Person('Tom', 25);

Then, we can use the json_encode function to convert it into json String array in the format:

$json = json_encode($person);
echo $json;

Executing the above code will output a string similar to the following:

{"name":"Tom","age":25}

As you can see, this string is very similar to the way objects are represented in JavaScript. , is a set of key-value pairs enclosed by curly braces.

The json_encode function also supports conversion of data types such as arrays and nested objects. For example, we can create an array containing multiple Person objects:

$person1 = new Person('Tom', 25);
$person2 = new Person('Jerry', 27);
$person3 = new Person('Lucy', 23);
$persons = array($person1, $person2, $person3);
$json = json_encode($persons);
echo $json;

The output is as follows:

[{"name":"Tom","age":25},{"name":"Jerry","age":27},{"name":"Lucy","age":23}]

As you can see, the json_encode function converts each object in the array into a json formatted strings and place them in an array enclosed by square brackets.

In addition to converting the object into a string array in json format, the json_decode function can parse the string array into an object. For example, we can use the json_decode function to parse the above string array into an array:

$data = json_decode($json, true);
print_r($data);

The output result is as follows:

Array
(
    [0] => Array
        (
            [name] => Tom
            [age] => 25
        )

    [1] => Array
        (
            [name] => Jerry
            [age] => 27
        )

    [2] => Array
        (
            [name] => Lucy
            [age] => 23
        )
)

Among them, the second parameter is true to parse the json string into an array, otherwise it will be parsed into an object.

To sum up, json is a very convenient data exchange format that can make full use of parsing tools in various languages ​​for data processing. In PHP, you can use the json_encode function to convert objects into json format string arrays, and use the json_decode function to parse json string arrays into objects or arrays, thereby realizing data interoperability between different languages.

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