深入浅析php json 格式控制

PHP教程
<?php
// 索引数组
$arr = ['item1','item2','item3'];
// 关联数组
$arr = [
 'name' => '张三','age' => '22',]; 

PHP教程
<?php
$arr = [ // 不是 0 开始,会输出对象
 1 => 'item1',2 => 'item2',3 => 'item3',];
echo "输出对象: ",json_encode($arr),"n";
// 输出对象: {"1":"item1","3":"item3"}
$arr = [ // 连续索引,输出数组
 0 => 'item1',1 => 'item2',2 => 'item3',];
echo "输出数组: ","n";
// 输出数组: ["item1","item3"]
$arr = [ // 连续索引,输出数组 
 'item1','item3',"item3"]
$arr = [ // 索引不连续,输出对象
 0 => 'item1',5 => 'item5',"n";
// 输出对象: {"0":"item1","1":"item2","2":"item3","5":"item5"}
$arr = [ // 包含关联索引,一定输出对象
 0 => 'item1','other' => '其他字段'
];
echo "输出对象: ","other":"u5176u4ed6u5b57u6bb5"}
// 关联数组 + 索引数组 实例
$arr = [ // 关联数组
 'other' => '其他字段','count' => 3,// 数组个数
 'list' => [ // 索引数组
  'item1',],];
echo "对象+数组: ","n";
// 对象+数组: {"other":"u5176u4ed6u5b57u6bb5","count":3,"list":["item1","item3"]} 

PHP教程
$arr = $User->where($where)->find(); // 读取数据
$list = [];
foreach($arr as $key => $val) { // 遍历数组
 $list[$key] = [
  'name' => $val['name'],'age' => $val['age'],];
}
$list['count'] = count($arr); // 其他属性
echo json_encode($list); // 输出 json
// {"1":{"name":"zhangsan","age":22},"2":{"name":"lisi","age":25},"count":2} 

PHP教程
$arr = $User->where($where)->find(); // 读取数据
$list = [];
foreach($arr as $key => $val) { // 遍历数组
 $list['list'][] = [ // 修改这里
  'name' => $val['name'],];
}
$list['count'] = count($arr); // 其他属性
echo json_encode($list); // 输出 json
// {"list":[{"name":"zhangsan",{"name":"lisi","age":25}],"count":2}