JSON Quick Start Learning Tutorial

Source: Internet
Author: User
Tags format array object character set hash json string variable
JSON Quick Start

Three kinds of data in computer language
1, scalar a separate string or number such as "Chengdu"; 7
2, the sequence of some related data in a certain order together (array or list) such as "Beijing, Chengdu"; 7 8 9
3, mapping name/value pairs that is the data name and corresponding value is called hash (hash) or dictionary and so on, such as "Sichuan Capital: Chengdu"

JSON (JavaScript Object notation) is a lightweight data interchange Format

four basic rules for JSON
(1) The data in parallel is separated by commas (",").
(2) The mapping is represented by a colon (":").
(3) The set (array) of parallel data is represented by square brackets ("[]").
(4) The mapped collection (object) is represented by braces ("{}")

the benefits of JSON
1. The data format is relatively simple, easy to read and write, the format is compressed, occupy a small bandwidth.
2. Support a variety of languages, including Actionscript,c,c#,coldfusion,java,javascript,perl,php,python,ruby, such as server language, easy to server-side resolution.

The disadvantage of JSON
1. The required character set must be Unicode and strongly constrained.
2. Grammar is too rigorous and must conform to the four principles of the JSON syntax.

Comparison of four data formats
XML is a subset of standard Universal Markup Language (SGML) that is ideal for web transport.
XML provides a uniform way to describe and exchange structured data that is independent of applications or vendors.

JSON is based on a subset of JavaScript programing Language,standard ECMA-262 3rd Edition-december 1999.

Serialize is a JSON-like data format, but PHP's serialize lecture variable is serialized to return a string expression with variable type and struct.

Array ()
Basic data types that cannot be used for transmission and exchange of data.

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