How to add value to json in php

How to add value to json in php: 1. Use json_decode() function to convert json data into array type, syntax "json_decode(json data, TRUE)"; 2. Use "$array variable name[' New key name '] = new value;" statement adds a new value at the end of the array; 3. Use the json_encode() function to convert the added value array back to the JSON type, with the syntax "json_encode (array)".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

How to give json to php Add value

In php, you can use arrays to add values ​​to json.

Implementation steps:

1. Use json_decode() function to convert json into an array

json_decode() function can decode JSON data. Convert JSON data to array type.

<?php
header("Content-type:text/html;charset=utf-8");
$json = &#39;{"a":"php","b":"mysql","c":3}&#39;; 
var_dump($json); 
$arr=json_decode($json,TRUE);   
var_dump($arr);
?>

2. Use the $array variable name['new key name']=new value; statement to add a new value to the array

$Array variable name['new key name']=new value; statement can insert a new key-value pair at the end of the array.

$arr["d"]="hello";
var_dump($arr);

3. Use the json_encode() function to convert the array back to JSON type

$Newjson=json_encode($arr);
var_dump($Newjson);

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