Create a json schema to validate against

Code
<?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());
Result
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(3) {
    ["property"] => string(0) ""
    ["message"] => string(93) "The property foobarbaz is not defined and the definition does not allow additional properties"
    ["constraint"] => string(14) "additionalProp"
  }
}