Detailed explanation of json format control in php
JSON is widely used in data transmission due to its high-performance transmission and analysis. This article mainly introduces relevant information on in-depth analysis of php json format control. I hope to be helpful.
Regarding the issue of json, novice friends have come to me one after another to ask, for example, why I output {"1":"item1","2":"item2","3":"item3 "} instead of ["item1","item2","item3"].
php array and js array
I use the above syntax of php 5.4 here.
There are associative arrays and index arrays in php, for example:
##
<?php // 索引数组 $arr = ['item1', 'item2', 'item3']; // 关联数组 $arr = [ 'name' => '张三', 'age' => '22', ];
php Array Output Format Control
<?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","2":"item2","3":"item3"}
$arr = [ // 连续索引，输出数组
0 => 'item1',
1 => 'item2',
2 => 'item3',
];
echo "输出数组: ", json_encode($arr), "\n";
// 输出数组: ["item1","item2","item3"]
$arr = [ // 连续索引，输出数组
'item1',
'item2',
'item3',
];
echo "输出数组: ", json_encode($arr), "\n";
// 输出数组: ["item1","item2","item3"]
$arr = [ // 索引不连续，输出对象
0 => 'item1',
1 => 'item2',
2 => 'item3',
5 => 'item5',
];
echo "输出对象: ", json_encode($arr), "\n";
// 输出对象: {"0":"item1","1":"item2","2":"item3","5":"item5"}
$arr = [ // 包含关联索引，一定输出对象
0 => 'item1',
1 => 'item2',
2 => 'item3',
'other' => '其他字段'
];
echo "输出对象: ", json_encode($arr), "\n";
// 输出对象: {"0":"item1","1":"item2","2":"item3","other":"\u5176\u4ed6\u5b57\u6bb5"}
// 关联数组 + 索引数组 实例
$arr = [ // 关联数组
'other' => '其他字段',
'count' => 3, // 数组个数
'list' => [ // 索引数组
'item1',
'item2',
'item3',
],
];
echo "对象+数组: ", json_encode($arr), "\n";
// 对象+数组: {"other":"\u5176\u4ed6\u5b57\u6bb5","count":3,"list":["item1","item2","item3"]}$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($list); // 输出 json
// {"1":{"name":"zhangsan","age":22},"2":{"name":"lisi","age":25},"count":2}$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'],
'age' => $val['age'],
];
}
$list['count'] = count($arr); // 其他属性
echo json_encode($list); // 输出 json
// {"list":[{"name":"zhangsan","age":22},{"name":"lisi","age":25}],"count":2}
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