PHP学习-json格式数据的操作2018-03-22

json_encode() 与 json_decode();

函数 描述
json_encode 对变量进行 JSON 编码
json_decode 对 JSON 格式的字符串进行解码，转换为 PHP 变量
json_last_error 返回最后发生的错误

<?php

/**
 * JSON format                                               //json数据类型
 * 数组：1.[1,2,3]                                           //普通数组
 *       2.[1,2,3,"hello","world]                            //混合类型数组
 *       3.[1.2.3."hello","world",[4,5,6,]]                  //数组中含有数组
 *       4.[1.2.3."hello","world",[4,5,6,],{"h":"hello"}]   //数组中含有数组与对象
 *
 * 对象：1.{"H":"hello"}                                      //普通对象
 *       2.{"H":"hello",[1.2.3]}                            //含有数组的对象
 */

//encode >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>        //其他类型转JSON类型
$arr= array(1,2,3,"hello",array("h"=>"hello"));             //1
print_r($arr);
echo "<br><br>";
echo json_encode($arr);
echo "<br><br>";


$obj=array("h"=>"hello",array(1,2,3));                      //2
print_r($obj);
echo "<br><br>";
echo json_encode($obj);
echo "<br><br>";

//decode >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>        //JSON类型转其他类型
$jsonStr = '{"h":"hello","0":[1,2,3]}';
$abc = json_decode($jsonStr);
print_r($abc);

输出：

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => hello [4] => Array ( [h] => hello ) )

[1,2,3,"hello",{"h":"hello"}]

Array ( [h] => hello [0] => Array ( [0] => 1 [1] => 2 [2] => 3 ) )

{"h":"hello","0":[1,2,3]}

stdClass Object ( [h] => hello [0] => Array ( [0] => 1 [1] => 2 [2] => 3 ) )