JSON data validation with Swagger definitions (through justinrainbow/json-schema)

swagger-validation.php

<?php

// composer require justinrainbow/json-schema

require __DIR__.'/vendor/autoload.php';

$jsonSchema = json_decode(
    file_get_contents('https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v2.0/json/petstore-simple.json')
);

$schemaStorage = new \JsonSchema\SchemaStorage();
$schemaStorage->addSchema('file://petstore', $jsonSchema);

$factory = new \JsonSchema\Constraints\Factory($schemaStorage);

$jsonValidator = new \JsonSchema\Validator($factory);
$jsonValidator->check(
    json_decode('{"data":123}'),
    (object) ['$ref' => 'file://petstore#/definitions/NewPet']
);
var_dump($jsonValidator->isValid()); // false
var_dump($jsonValidator->getErrors()); // [{"property":"name","pointer":"\/name","message":"The property name is required","constraint":"required"}]

var_dump('####################################################################');

$jsonValidator = new \JsonSchema\Validator($factory);
$jsonValidator->check(
    json_decode('{"name": "Cat", "tag": "miaou"}'),
    (object) ['$ref' => 'file://petstore#/definitions/NewPet']
);
var_dump($jsonValidator->isValid()); // true
var_dump($jsonValidator->getErrors()); // []