Two times Json_encode () and two times Json_decode ()

I didn't notice these two functions before, and someone in the group asked yesterday. Discover the following things.

Header ("content-type:text/html;charset=utf-8"= Array ('a '=1,'b'== 2=  = == json_decode ($arr _1); Var_dump ($obj); Echo $obj->a;

Results:

String ' {"A": 1, "B": 2} ' (length=13) string ' "{\" a\ ": 1,\" B\ ": 2}" ' (length=19) string ' "{\" a\ ": 1,\" B\ ": 2}" ' (length=19) String ' {' A ': 1, ' B ': 2} ' (length=13) object (StdClass) [1] public  ' a ' = = int 1 public  ' b ' = = int 21

Using Json_encode () two or n times will escape the previously-turned JSON string.

Look at the API for Json_encode ()

String Json_encode ( mixed $value [, int $options = 0])

This says that the first argument is a mixed type, except that the rest of the resource can. The following parameters. Don't want to deviate from the theme.

Since the first call to Json_encode () is an array, the second time the Json_encode () method is called, the argument is a string.

With Json_decode ();

Mixed json_decode ( string $json [, bool $assoc = False [, int $depth = [ +], in T $options = 0]])

The API says that only JSON strings can be placed.

But when we json_decode the second time, the arguments passed in are actually an array. Returned to us with an object.

Two times Json_encode () and two times Json_decode ()