I don't know how the graph data in your question comes from

if someone calls your interface, no matter how it is called, you only need to agree on the format type to be returned.
generally return data in json or xml format
and then call the interface to parse your returned data and then use it

then back to the point, if someone else calls your interface, then you only need to return the data in json format. Your array data is converted to json through json_encode . The caller can parse your json data into an array through json_decode ($json, true) ).

array or object, these are the data structure implementations of specific languages. When you do the "contract" thing, you only need to pay attention to whether the character format used for network transmission is JSON or XML. The specific local language will translate JSON into what structure, just make sure that the JSON format is legal and can be used by both of you.

try processing your data this way.

$string = '{"errno": "1","errstr":"2"}{"errno": "1","errstr":"2"}';
$string = '['.str_replace('}{','},{', $string).']';
var_dump(json_decode($string,true));