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PHP 数组转json格式，key的保存问题

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12/02
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 <?php

 $arr = [

     2,

     3,

 ];

 echo print_r($arr,true);

 echo json_encode($arr);

 echo "\n\n";

 $arr = [

     0 => 2,

     1 => 3,

 ];

 echo print_r($arr,true);

 echo json_encode($arr);

 echo "\n\n";

 $arr = [

     0 => 2,

     2 => 3,

 ];

 echo print_r($arr,true);

 echo json_encode($arr);

 echo "\n\n";

 $arr = [

     1 => 2,

     2 => 3,

 ];

 echo print_r($arr,true);

 echo json_encode($arr);

 echo "\n\n";

 $arr = [

     '0' => 2,

     '1' => 1,

 ];

 echo print_r($arr,true);

 echo json_encode($arr);

 echo "\n\n";

 $arr = [

     '1' => 2,

     '2' => 1,

 ];

 echo print_r($arr,true);

 echo json_encode($arr);

 echo "\n\n";

 $arr = [

     '0' => 2,

     '2' => 1,

 ];

 echo print_r($arr,true);

 echo json_encode($arr);

 echo "\n\n";

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