<?php

use JsonSchema\Uri\UriRetriever;
use JsonSchema\Validator;
use Zend\Debug\Debug;

// json config which should be valid to the schema
$data = <<<EOT
{
    "name": "foo",
    "value": "bar"
}
EOT;

$wrongdata = <<<EOT
{
    "name": "foo",
    "value": "bar",
    "foobarbaz": "value"
}
EOT;

// the json schema
$schemaPath = __DIR__ . '/resources/jsonschema.json';
Debug::dump(file_get_contents($schemaPath));

// retrieve schema for validation
$retriever = new UriRetriever();
$schema = $retriever->retrieve('file://' . $schemaPath);

$validator = new Validator();

// do the schema validation
$validator->check(json_decode($data), $schema);
Debug::dump($validator->isValid());

$validator->check(json_decode($wrongdata), $schema);
Debug::dump($validator->isValid());
Debug::dump($validator->getErrors());

string(389) "{
    "name": "Config",
    "type": "object",
    "additionalProperties": false,
    "properties": {
        "name": {
            "type": "string",
            "description": "Name of the option",
            "required": true
        },
        "value": {
            "description": "value of the option",
            "type": "string",
            "required": true
        }
    }
}
"

bool(true)

bool(false)

array(1) {
  [0] => array(5) {
    ["property"] => string(0) ""
    ["pointer"] => string(0) ""
    ["message"] => string(93) "The property foobarbaz is not defined and the definition does not allow additional properties"
    ["constraint"] => string(14) "additionalProp"
    ["context"] => int(1)
  }
}

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PHP 7.2, Zend 3.0, Symfony 4.0, Laravel 5.6, PHPUnit 6.5, Doctrine 2.8