Convert array to json in php

As a programming language widely used in back-end development and web application development, PHP is extremely flexible when processing data. Among them, arrays are one of the most commonly used data structures in PHP, and converting arrays to strings in JSON format is also one of the operations frequently used in development. Therefore, in this article, we will introduce how to convert arrays in PHP. for JSON.

1. What is JSON?

JSON (JavaScript Object Notation) is a lightweight data exchange format proposed by Douglas Crockford in 2001 and has gradually become widely used. It is based on the syntax of the JavaScript language, but unlike it, it can be parsed and generated by multiple languages. The advantages of JSON are that it is easy to read and understand and has high interoperability.

JSON consists of simple data types (strings, numbers, Boolean values, null) and two composite types (arrays and objects). Among them, arrays are a commonly used data type.

2. Arrays in PHP

In PHP, arrays are a very flexible data structure that can store different types of data and combine different types of data Make a combination. Arrays in PHP can be accessed through subscripts and associated keys (i.e. strings), and advanced syntax sugar can also be used for iteration, filtering and other operations.

PHP provides some convenient functions for processing arrays, such as: array_push(), array_pop(), array_shift(), array_unshift(), array_slice(), etc. At the same time, PHP also provides some special array functions, such as array_map(), array_reduce(), array_filter(), etc., which can easily process and convert arrays.

3. Convert an array to JSON in PHP

In PHP, to convert an array to JSON, you can use the function json_encode(). This function converts a PHP variable (such as an array) into a JSON-formatted string. The following is the basic usage of the json_encode() function:

$my_array = array('foo', 'bar', 'baz');
$json_string = json_encode($my_array);
echo $json_string;

This code will output:

["foo","bar","baz"]

In this example, we first create an array $my_array containing 3 string elements , and then use the json_encode() function to convert it to a JSON-formatted string. Finally, use the echo statement to output the string.

It should be noted that the json_encode() function also has some parameters that can be used to control the format, compatibility, depth, etc. of JSON generation. The following are some commonly used parameters:

• In the second parameter of the function, you can use the constant JSON_PRETTY_PRINT to generate a beautiful, indented JSON-formatted string.

$my_array = array('foo', 'bar', 'baz');
$json_string = json_encode($my_array, JSON_PRETTY_PRINT);
echo $json_string;

This code will output:

[
    "foo",
    "bar",
    "baz"
]

• In the third parameter of the function, you can use the constant JSON_UNESCAPED_UNICODE to generate JSON format without escaping Unicode characters. String.

$my_array = array("中文", "English");
$json_string = json_encode($my_array, JSON_UNESCAPED_UNICODE);
echo $json_string;

This code will output:

["中文","English"]

Here we create an array $my_array containing Chinese and English elements, and use the JSON_UNESCAPED_UNICODE parameter to represent unescaped Unicode characters.

Summary

In this article, we introduced the concept of JSON and its application in PHP, and how to use PHP's own function json_encode() to convert PHP arrays into JSON format characters string, and also discusses some parameters that can be used when generating JSON. I believe that for web application developers, the application of JSON and arrays is very important. I hope this article can inspire everyone.

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