Some notes on the json_encode() and json_decode() functions in php
一,json语法( php中的json_decode($json)中的$json要符合json语法格式 )
① JSON可以表示三种类型的值
1,简单值。包括整型,字符串型,布尔值和null。例如:5,"hello world",true,null都是有效的JSON数据。其中JSON字符串必须使用双引号(单引号会导致语法错误)。
2,对象。如,{"name":"tony","age":15}。说明①要求属性必须用双引号(不加或者单引号都是错误的)②值可以是简单值(注意若值为字符串,必须用双引号,不能用单引号),也可以是复杂类型的值(对象或数组)。
3,数组。如,[25,true,"tony"]。说明:数组的值也可以是任意类型。
二,php定义对象字面量时,不支持直接书写,如{"a":"11","b":"22"}。这种书写方式在其他语言中被支持,在php中需要按如下方式定义:
① $a = '{"a":"11","b":"22"}' ;【这是json字符串,不加外面的单引号则是json对象】
② $b = json_decode($a);
这样$b就是对象字面量了。
三,上述三种数值类型经过json_encode($value)转化后,会输出json格式(此时类型为字符串),如"hello",{},[]。输出的结果可以在其他地方(javascrip,ios,java,php等等)被解析使用。
四,php中改进后的json_encode()和json_decode()函数,支持汉语(原生的不支持汉语)
注:php中不可直接改写原生函数,需要写在类里,作为类的一个方法
static function json_encode($input) { // 从 PHP 5.4.0 起, 增加了这个选项. if (defined('JSON_UNESCAPED_UNICODE')) { return json_encode($input, JSON_UNESCAPED_UNICODE); } if (is_string($input)) { $text = $input; $text = str_replace('\\', '\\\\', $text); $text = str_replace( array("\r", "\n", "\t", "\""), array('\r', '\n', '\t', '\\"'), $text); return '"' . $text . '"'; } else if (is_array($input) || is_object($input)) { $arr = array(); $is_obj = is_object($input) || (array_keys($input) !== range(0, count($input) - 1)); foreach ($input as $k => $v) { if($v == null){ $v = 'null'; } if ($is_obj) { $arr[] = self::json_encode($k) . ':' . self::json_encode($v); } else { $arr[] = self::json_encode($v); } } if ($is_obj) { return '{' . join(',', $arr) . '}'; } else { return '[' . join(',', $arr) . ']'; } } else { return $input . ''; } }

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

To work on file upload we are going to use the form helper. Here, is an example for file upload.

In this chapter, we are going to learn the following topics related to routing ?

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Validator can be created by adding the following two lines in the controller.
