Webmozart\Json\JsonValidator::assertSchemaValid PHP Method

    private function assertSchemaValid($schema)
    {
        if (null === $this->metaSchema) {
            // The meta schema is obviously not validated. If we
            // validate it against itself, we have an endless recursion
            $this->metaSchema = json_decode(file_get_contents(__DIR__ . '/../res/meta-schema.json'));
        }
        if ($schema === $this->metaSchema) {
            return;
        }
        $errors = $this->validate($schema, $this->metaSchema);
        if (count($errors) > 0) {
            throw new InvalidSchemaException(sprintf("The schema is invalid:\n%s", implode("\n", $errors)));
        }
    }