How to convert json to array in php

During the PHP programming process, it is often necessary to obtain the json format data through getJSON or other methods. At this time, it needs to be converted into an array for subsequent processing. This article will introduce how to convert json format data into an array in php.

1. Use php built-in function json_decode() to convert

php provides a very simple method to directly convert json to an array using the built-in function json_decode() . The usage method is as follows:

$json_str = '{"name":"Tom","age":"18","gender":"male"}';
$arr = json_decode($json_str, true);

Among them, the first parameter of the json_decode function is the json string that needs to be converted, and the second parameter is an optional Boolean value, indicating whether to return it in the form of an array. If you do not set the value of this parameter, the result will be returned in the form of an object by default.

Suppose the above json string conversion result is as follows:

Array
(
    [name] => Tom
    [age] => 18
    [gender] => male
)

2. Use a third-party library for conversion

If you need to perform more complex processing on json format data Operation, it is recommended to use a third-party library for processing. Currently, there are two well-known open source libraries in PHP that we can use, namely jsonkit and jsonpath.

2.1. Jsonkit

Jsonkit is a json processing tool developed by qqxhb. It provides multiple functions to support parsing, encapsulation, formatting and other operations of json data. Among them, the json_decode() function can convert a json string into an array, and the json_encode() function can convert an array into a json format string.

Usage:

$json_str = '{"name":"Tom","age":"18","gender":"male"}';
$arr = jsonkit_decode($json_str);

Among them, the first parameter of the jsonkit_decode() function is the json string that needs to be converted, and the return value is in the form of an array.

2.2. Jsonpath

Jsonpath is a more powerful json processing library that can support query, conversion and other operations on json data. Usage:

$json_str = '{"name":"Tom","age":"18","gender":"male"}';
$jp = new JsonPath($json_str);
$arr = $jp->json_decode();

Among them, the JsonPath class is developed by BrainMaestro. We need to first pass the json data that needs to be processed into the class, and then call the json_decode() function to convert it into an array.

Summary:

The above is how PHP uses built-in functions and third-party libraries to convert json into an array. If you only need simple conversion operations, it is recommended to use the built-in function json_decode. If more operations are needed, you can choose to use a third-party library to handle it. At the same time, you need to pay attention to the correctness of the json string format, otherwise the conversion may fail.

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