Ask what format data this is

What is the format of this data?
a:4:{i:0;i:392;i:1;i:393;i:2;i:394;i:3;i:395;}
This is read from the database. Judge this is_array return 1
That is the array type. How can this be converted to a string or to JS use it? Thank you

------Solution--------------------
This is the PHP serialization (serialize) data
It's impossible to return 1 with Is_array.
Unless you do the deserialization (unserialize)

$a = unserialize (' a:4:{i:0;i:392;i:1;i:393;i:2;i:394;i:3;i:395;} ');
Echo ' ['. Join (', ', $a). ']';
Or
echo Json_encode ($a);

[392,393,394,395]
You can use it for JS.
------Solution--------------------
1, the serialized data first uses unserialize to deserialize, obtains the original array;
2, if you want to pass the PHP array to JS, it must be converted to JSON, and then JS access to JSON data

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