Convert json to json array+php

With the rapid development of Internet technology, Web development has become more and more popular. In web development, Json is a common data format that is widely used for data transmission and interaction. In actual development, we may encounter the need to convert Json to a Json array. At this time, PHP's Json processing function can come in handy.

This article will introduce how to use PHP's Json processing function to convert Json to a Json array.

Basic concept of Json

Json is a lightweight data exchange format. It is based on a subset of the JavaScript language and can be parsed and generated by a variety of programming languages.

Json consists of two common data structures: objects and arrays. An object is an unordered collection consisting of a set of name/value pairs, each name/value pair is separated by commas, and all name/value pairs are enclosed in curly braces {}. For example:

{
    "name": "Tom",
    "age": 22,
    "gender": "male",
    "address": {
        "city": "Beijing",
        "country": "China"
    }
}

The above is a Json object, which contains four attributes named name, age, gender and address. where address is a nested Json object.

An array is a collection of ordered values, each value is separated by commas, and all values ​​are enclosed in square brackets []. For example:

[
    "apple",
    "banana",
    "orange"
]

The above is a Json array, which contains three string type values: apple, banana and orange.

Convert Json to Json array

Sometimes we need to convert Json object to Json array. For a Json object, if its attribute names are all numbers, it can be converted into a Json array. For example:

{
    "0": "apple",
    "1": "banana",
    "2": "orange"
}

The above is a Json object that can be converted into a Json array. So how to convert it using PHP?

PHP provides a Json processing extension module through which we can easily convert Json into a Json array. The specific steps are as follows:

1. Use the json_decode function to parse the Json string into a PHP object or array.

$json_str = '{"0":"apple","1":"banana","2":"orange"}';
$json_obj = json_decode($json_str);

The above code parses the Json string into a PHP object. The value of $json_obj is:

stdClass Object
(
    [0] => apple
    [1] => banana
    [2] => orange
)

2. If you need to convert the PHP object into a PHP array, you need to use The second parameter of the json_decode function is a Boolean parameter to control the type of return value. If the value of this parameter is true, a PHP array is returned; if the value of this parameter is false or the default value is null, a PHP object is returned.

$json_str = '{"0":"apple","1":"banana","2":"orange"}';
$json_arr = json_decode($json_str, true);

The above code parses the Json string into a PHP array. The value of $json_arr is:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
)

For more information on how to use the json_decode function, please refer to the official documentation:

https://www.php.net/manual/zh/function.json-decode.php

Summary

Json is a common data format used in Web development is widely used in. Converting Json to a Json array is one of the common needs, and PHP's Json processing function can easily achieve this function. Through the introduction of this article, I hope readers can skillfully use PHP's Json processing function to develop Web applications more efficiently.

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