W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<body>
<?php
$jsonobj = '{"Peter":35,"Ben":37,"Joe":43}';
 
var_dump(json_decode($jsonobj));
?>
</body>
</html>

object(stdClass)#1 (3) { ["Peter"]=> int(35) ["Ben"]=> int(37) ["Joe"]=> int(43) }