// a
[1,2,3,4]
// b
["0"=>1, "1"=>2, "2"=>3, "3"=>4]
a b php a ""
a foreach b
a
a b json_encode() 
// a
[1,2,3,4]
// b
["0"=>1, "1"=>2, "2"=>3, "3"=>4]
a b php a ""
a foreach b
a
a b json_encode() . Definitely different, an association, an index, in the json format display using {} [] to distinguish. Php has a function that can directly get all the values of the array, you can learn about it. Array_values
you can directly use array_values ($b) to return to the $an array;
don't worry about this problem later, it doesn't make much sense, and an is an indexed array, b is an associative array
and you correspond to an associative array in this numerical order, json_decode () is the same as the indexed array, that is, in the scenario above.
you can use array_values directly
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