<?php
$a = [
    "name",
    "age"
];
var_dump( json_encode($a)); the result is"["name", "age"]"
 this is a json data is fine, but what is returned is a json collection and what I need is a json object, I expect the following result 
"{"name", "age"}",
my solution now is to change my code as follows
$a = [
    "name" => 1,
    "age" => 1
];
var_dump( json_encode($a)); that is, to change the array into a key-value pair, each key has the same value of 1, which is useless. The result is as follows: 
"{"name": 1, "age": 1}"
 this can meet my needs, but personally, this is a bit too low. I don"t know if there is a good way 

