ajax3—php（29）

1. Application of json in Ajax

For the processing of large batches of data:

1) } To simulate an unordered collection of attributes

1. About json in php

Currently, most ajax programs use json objects as data transfer methods, so many languages ​​​​have built-in support for json Object support. In php, there are two functions for encoding and decoding json

l string json_encode (mixed $value)

Generate a string in json format

l mixed json_decode (string $json [, bool])

Parse json

The second parameter indicates whether to parse into an array or an object. The default is false, which means parsing into an object

1) json_encode

If you want to get data in json format, you must first get an array or Object

2) json_decode

3) json_decode

Json currently only supports utf-8 format

3, Ajax uses json

Example 1: Return two using json Four arithmetic operations of numbers

Server code:

Example 2: Return multiple pieces of data from the server

Ajax program:

Php program:

The above has introduced ajax3-php (29), including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.