php 转换 json 方法

旧城等待， 2022-05-12 02:08 246阅读 0赞

# 说明 #

> 了解 PHP 下数组使用方法  
> 了解函数 json\_decode， json\_encode 使用方法  
> php 环境下如何输出 json 格式

# 前提 #

> PHP 下， 默认不支持直接进行 json 格式定义  
> PHP 下支持 array 定义  
> 可以通过函数帮助， 把（多维）数组转换成为 json 格式输出  
> 注意， 中文字符需要特殊处理

# 数组 #

## 一维数组定义方法 ##

定义方法

$a= [ 'a' => '123', 'b' => '234' ];
     $b=array( 'a' => '123', 'b' => '234' );
     print_r ($a);
     print_r ($b);

输出效果

Array
    (
        [a] => 123
        [b] => 234
    )
    Array
    (
        [a] => 123
        [b] => 234
    )

## 多维数组定义方法 ##

定义方法,

$a = array(
        'a' => '123',
        'b' => array(
            'c' => '234',
            'd' => '345',
        ),
        'e' => '456',
      );
    
    $b = [
        'f' => '123',
        'g' => [
            'h' => '234',
            'i' => '345',
        ],
        'j' => '456',
    ];

输出效果

Array
    (
        [a] => 123
        [b] => Array
            (
                [c] => 234
                [d] => 345
            )
    
        [e] => 456
    )
    Array
    (
        [f] => 123
        [g] => Array
            (
                [h] => 234
                [i] => 345
            )
    
        [j] => 456
    )

## 数组叠加方法 ##

定义方法

$c = array();
    array_push($c, $a);
    array_push($c, $b);
    print_r ($c);

输出效果

Array
    (
        [0] => Array
            (
                [a] => 123
                [b] => Array
                    (
                        [c] => 234
                        [d] => 345
                    )
    
                [e] => 456
            )
    
        [1] => Array
            (
                [f] => 123
                [g] => Array
                    (
                        [h] => 234
                        [i] => 345
                    )
    
                [j] => 456
            )
    
    )

## 把数组定义为 JSON 格式 ##

定义方法: (注意，带中文输出)

$a = array(
        'a' => '123',
        'b' => array(
            'c' => '234',
            'd' => '345',
        ),
        'e' => '中文字符456',
      );
    
    $b = [
        'f' => '123',
        'g' => [
            'h' => '234',
            'i' => '345',
        ],
        'j' => '中文字符c',
    ];
    $c = array();
    
    array_push($c, $a);
    array_push($c, $b);
    var_dump(json_encode($c,JSON_UNESCAPED_UNICODE));

输出效果

string(119) "[{"a":"123","b":{"c":"234","d":"345"},"e":"中文字符456"},{"f":"123","g":{"h":"234","i":"345"},"j":"中文字符c"}]"

## 参考例子 ##

> 例子:
> 
> > 这里有两个多维数组，数组具有相同的元素 ‘uuid’  
> > 把数组转换为 JSON

定义方法

<?php $a = [ 'uuid' => 'c5966c24-7e8d-4e22-b4c8-29a035fec704', 'ipaddr' => '1.1.1.1', 'hostname' => 'test1.google.com', ]; $b = [ 'uuid' => '3e7a74b4-75df-41b5-b0f9-88f459b68b3c', 'ipaddr' => '2.2.2.2', 'hostname' => 'test2.google.com', ]; $c = array(); array_push($c, $a); array_push($c, $b); $d = [ 'uuid' => 'c5966c24-7e8d-4e22-b4c8-29a035fec704', 'user' => 'terry', 'sex' => 'male', ]; $e = [ 'uuid' => '3e7a74b4-75df-41b5-b0f9-88f459b68b3c', 'user' => 'mary', 'sex' => 'female', ]; $f = array(); array_push($f, $d); array_push($f, $e); $g = json_encode($c,JSON_UNESCAPED_UNICODE); $h = json_encode($f,JSON_UNESCAPED_UNICODE); print $g; print $h; ?>

输出效果

json1
    [{
       "uuid":"c5966c24-7e8d-4e22-b4c8-29a035fec704","ipaddr":"1.1.1.1","hostname":"test1.google.com"},{
       "uuid":"3e7a74b4-75df-41b5-b0f9-88f459b68b3c","ipaddr":"2.2.2.2","hostname":"test2.google.com"}]
    json2
    [{
       "uuid":"c5966c24-7e8d-4e22-b4c8-29a035fec704","user":"terry","sex":"male"},{
       "uuid":"3e7a74b4-75df-41b5-b0f9-88f459b68b3c","user":"mary","sex":"female"}]

## 把上述两个数组组合为一个数组 ##

组合方法

foreach(json_decode($g, JSON_UNESCAPED_UNICODE) as $key => $array)
      {
         $r[$key] = array_merge(json_decode($h, JSON_UNESCAPED_UNICODE)[$key],$array);
      }

输出效果, 结合成为一个 json 数据

[{"uuid":"c5966c24-7e8d-4e22-b4c8-29a035fec704","user":"terry","sex":"male","ipaddr":"1.1.1.1","hostname":"test1.google.com"},{"uuid":"3e7a74b4-75df-41b5-b0f9-88f459b68b3c","user":"mary","sex":"female","ipaddr":"2.2.2.2","hostname":"test2.google.com"}]