PHP json_encode values in curly braces and curly braces

1. When array is a continuous array starting from 0, the result of Json_encode is a string enclosed by []

And when array is not starting from 0 or discontinuous arrays, the result of Json_encode is a string of key-value pattern enclosed by {}

$test = Array ();

$test [] = 1;

$test [] = 1;

$test [] = 1;

echo Json_encode ($test);

Results:

[1,1,1]

$test = Array ();

$test [] = 1;

$test [] = 1;

$test [] = 1;

unset ($test [0]);

echo Json_encode ($test);

Results:

{"1": 1, "2": 1}

2. When the string is [1,1,1] This mode, the Json_decode default parsing result is an array,

When the string is {"1": 1, "2": 1} This mode, the result of Json_decode default parsing is an object, you can set its second argument to true to force it to return the array

3. This occurs because PHP cannot differentiate between one-dimensional and two-dimensional arrays because it is recommended to set the second parameter to TRUE when using JSON encoding

PHP json_encode values in curly braces and curly braces