PHP - JSON解析 - 添加和删除对象

Question

I am getting [{"2016":"200"},{"2017":"200"}] This JSON string from server , I want to append another object ie. {"2018":"324"} at the end of the existing JSON array and want to delete object at the 0th index the existing JSON array so that the my desired result [{"2017":"200"}{"2018":"324"}] can be obtained. Here's what i am doing

        $str = json_decode($x1,TRUE);                    //x1 is my JSON
        array_push($str, array("2018"=>"324"));     //adding another object
        unset($str[0]);                             //removing 0th index
        $s = json_encode($str,TRUE);                    //making JSON again
        echo $s;                

Problem here is $s giving output in object form like {"1":{"2017":"200"},"2":{"2018":"35"}} While what is wanted is [{"2017":"200"}{"2018":"324"}]

Answer 1

I might suggest better approach, using array_shift():

$json = json_decode($x1, TRUE);   // decoding

array_shift($json);               // removing first element

$json[] = [ "2018" => "324" ];    // adding last element

$str = json_encode($json);        // encoding

echo $str; 

As others already pointed out, you getting object equivalent because your array not starting from 0 index, so it is converted in javascript object with numeric keys. I'm using array_shift() to remove first element. It will also reset indices in array. It also would be (insignificantly) faster, if you remove first key before adding other elements to array.