Question

假设我的JSON是这样的：

{
  "achievement": [
    {
      "title": "All Around Submitter",
      "description": "Get one piece of content approved in all six areas.",
      "xp": 500,
      "level_req": 1
    },
    {
      "title": "World-wide Photo Journalist",
      "description": "Get one photo approved in all six areas.",
      "xp": 500,
      "level_req": 1
    },
    {
      "title": "Ready for Work",
      "description": "Sign up and get validated",
      "xp": 50,
      "level_req": 1
    },
    {
      "title": "Asian Pride",
      "description": "Get ten pieces of content approved to a club in an Asian nation.",
      "xp": 1500,
      "level_req": 1
    }
  ]
}

我的PHP代码是这样的，所以我加载了json文件......：

<?php

$string = file_get_contents("achievements.json");
$json_a=json_decode($string,true);

foreach ($json_a as $key => $value){
  echo  $value[0]['title'] . " <br />";
}

?>

然而它只放出第一个数组。我知道。只有1.但foreach循环怎么样？为什么不是每行循环？

Answer 1

您正在遍历顶级数组，该数组只有一个键：achievement

相反，你应该

foreach ($json_a['achievement'] as $key => $value){
  echo  $value['title'] . " <br />";
}

提示：[0]是一种特定的代码气味。

Answer 2

这里试试这个

$string = file_get_contents("achievements.json");
$json_a=json_decode($string,true);

foreach ($json_a['achievement'] as $key => $value){
  echo  $value['title'] . " <br />";
}

你正在循环你的顶级数组，但在解析你的json之后你会得到：

array(1) {
  ["achievement"]=>
  array(4) {
  //your other arrays
  }
}

Answer 3

它无效，因为您循环的数组只有一个键achievements，这是您json_decode()返回的数组，给定您当前的json。循环一遍，你会得到你想要的东西：

foreach ($json_a['achievement'] as $key => $value){
    echo $value['title'] . "<br />";
}

PHP - json没有解析循环

3 个答案: