<?php
$group = '{"title":"Title", "artist":"Artist", "cover":"img/1.png", "file":"./file/1.mp3"}';
$result = [];
foreach($array as $key => $value) {
$result[] = $key . ':' . $value;
}
echo '{' . $result . '}';
PD9waHAKCiRncm91cCA9ICd7InRpdGxlIjoiVGl0bGUiLCAiYXJ0aXN0IjoiQXJ0aXN0IiwgImNvdmVyIjoiaW1nLzEucG5nIiwgImZpbGUiOiIuL2ZpbGUvMS5tcDMifSc7CgokYXJyYXkgPSBqc29uX2RlY29kZSgkZ3JvdXAsIHRydWUpOwokcmVzdWx0ID0gW107Cgpmb3JlYWNoKCRhcnJheSBhcyAka2V5ID0+ICR2YWx1ZSkgewogICAgJHJlc3VsdFtdID0gJGtleSAuICc6JyAuICR2YWx1ZTsKfQoKJHJlc3VsdCA9IGltcGxvZGUoJywnLCAkcmVzdWx0KTsKCmVjaG8gJ3snIC4gJHJlc3VsdCAuICd9Jzs=