說明

瞭解 PHP 下陣列使用方法
瞭解函式 json_decode， json_encode 使用方法
php 環境下如何輸出 json 格式

前提

PHP 下， 預設不支援直接進行 json 格式定義
PHP 下支援 array 定義
可以通過函式幫助， 把（多維）陣列轉換成為 json 格式輸出
注意， 中文字元需要特殊處理

陣列

一維陣列定義方法

定義方法

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

輸出效果

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

多維陣列定義方法

定義方法,

$a = array(
    'a' => '123',
    'b' => array(
        'c' => '234',
        'd' => '345',
    ),
    'e' => '456',
  );

$b = [
    'f'
 
 => '123',
    'g' => [
        'h' => '234',
        'i' => '345',
    ],
    'j' => '456',
];

輸出效果

Array
(
    [a] => 123
    [b] => Array
        (
            [c] => 234
            [d] => 345
        )

    [e] => 456
)
Array
(
    [f] => 123
    [g] => Array
 

        (
            [h] => 234
            [i] => 345
        )

    [j] => 456
)

陣列疊加方法

定義方法

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

輸出效果

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
        )

)

把陣列定義為 JSON 格式

定義方法: (注意，帶中文輸出)

$a = array(
    'a' => '123',
    'b' => array(
        'c' => '234',
        'd' => '345',
    ),
    'e' => '中文字元456',
  );

$b = [
    'f' => '123',
    'g' => [
        'h' => '234',
        'i' => '345',
    ],
    'j' => '中文字元c',
];
$c = array();

array_push($c, $a);
array_push($c, $b);
var_dump(json_encode($c,JSON_UNESCAPED_UNICODE));

輸出效果

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

參考例子

例子:

這裡有兩個多維陣列，陣列具有相同的元素 ‘uuid’
把陣列轉換為 JSON

定義方法

<?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;
?>

輸出效果

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"}]

把上述兩個陣列組合為一個數組

組合方法

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

輸出效果, 結合成為一個 json 資料

[{"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"}]