Paste JSON and get typed PHP classes: one per object, with a fromArray() factory that builds the whole tree from json_decode() output — no more guessing array keys.
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json_decode($body, true) gives you nested arrays, and from then on every access is a string key the IDE cannot check: $order['custmer']['email'] fails at runtime, in production, on the one code path nobody tested. A data transfer object moves that knowledge into types. Properties autocomplete, static analysers such as PHPStan and Psalm verify them, and a missing key fails at the boundary — where the data enters — instead of deep inside your logic.
string, int, float, bool, array or another generated class. Values that were null become mixed; optional ones get a nullable type.
PHP cannot type the elements of an array, so each list gets a docblock — @var Item[] — that IDEs and analysers understand.
fromArray()Each class has a static factory that reads the decoded array, including nested objects and lists of objects, and returns a fully built instance.
PHP 8 constructor promotion for compact, immutable-friendly classes, or plain public properties if you target older code.
Decode with exceptions enabled and pass the result to the root factory: $order = Root::fromArray(json_decode($body, true, flags: JSON_THROW_ON_ERROR));. With declare(strict_types=1), which the generated file sets, a value of the wrong type raises a TypeError right there.
Then adjust what a sample cannot know. Make the properties readonly if the object should not change. Turn date strings into DateTimeImmutable inside fromArray(). Replace float with integer cents or a money object for prices. And add a namespace and split the classes into files to match your autoloader.
json_decode($json) returns stdClass objects, and json_decode($json, true) returns arrays. For typed objects, generate classes here and build them with Root::fromArray(json_decode($json, true)).
The constructor promotion style needs PHP 8.0 or later, because of promoted properties, named arguments and the mixed type. The plain style works on PHP 7.4 after removing mixed.
Its value was null in the sample, so no type could be inferred. Replace mixed with the real type when you know it.
Yes, they are plain PHP. In Symfony you can instead let the Serializer component fill the same classes, and in Laravel they work well as DTOs between a client and your models.
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